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WP_Customize_Manager

Customize Manager class.

---

description

Bootstraps the Customize experience on the server-side.

Sets up the theme-switching process if a theme other than the active one is being previewed and customized.

Serves as a factory for Customize Controls and Settings, and instantiates default Customize Controls and Settings.

---

源代码

File: wp-includes/class-wp-customize-manager.php

final class WP_Customize_Manager {
	/**
	 * An instance of the theme being previewed.
	 *
	 * @since 3.4.0
	 * @access protected
	 * @var WP_Theme
	 */
	protected $theme;

	/**
	 * The directory name of the previously active theme (within the theme_root).
	 *
	 * @since 3.4.0
	 * @access protected
	 * @var string
	 */
	protected $original_stylesheet;

	/**
	 * Whether this is a Customizer pageload.
	 *
	 * @since 3.4.0
	 * @access protected
	 * @var bool
	 */
	protected $previewing = false;

	/**
	 * Methods and properties dealing with managing widgets in the Customizer.
	 *
	 * @since 3.9.0
	 * @access public
	 * @var WP_Customize_Widgets
	 */
	public $widgets;

	/**
	 * Methods and properties dealing with managing nav menus in the Customizer.
	 *
	 * @since 4.3.0
	 * @access public
	 * @var WP_Customize_Nav_Menus
	 */
	public $nav_menus;

	/**
	 * Methods and properties dealing with selective refresh in the Customizer preview.
	 *
	 * @since 4.5.0
	 * @access public
	 * @var WP_Customize_Selective_Refresh
	 */
	public $selective_refresh;

	/**
	 * Registered instances of WP_Customize_Setting.
	 *
	 * @since 3.4.0
	 * @access protected
	 * @var array
	 */
	protected $settings = array();

	/**
	 * Sorted top-level instances of WP_Customize_Panel and WP_Customize_Section.
	 *
	 * @since 4.0.0
	 * @access protected
	 * @var array
	 */
	protected $containers = array();

	/**
	 * Registered instances of WP_Customize_Panel.
	 *
	 * @since 4.0.0
	 * @access protected
	 * @var array
	 */
	protected $panels = array();

	/**
	 * List of core components.
	 *
	 * @since 4.5.0
	 * @access protected
	 * @var array
	 */
	protected $components = array( 'widgets', 'nav_menus' );

	/**
	 * Registered instances of WP_Customize_Section.
	 *
	 * @since 3.4.0
	 * @access protected
	 * @var array
	 */
	protected $sections = array();

	/**
	 * Registered instances of WP_Customize_Control.
	 *
	 * @since 3.4.0
	 * @access protected
	 * @var array
	 */
	protected $controls = array();

	/**
	 * Panel types that may be rendered from JS templates.
	 *
	 * @since 4.3.0
	 * @access protected
	 * @var array
	 */
	protected $registered_panel_types = array();

	/**
	 * Section types that may be rendered from JS templates.
	 *
	 * @since 4.3.0
	 * @access protected
	 * @var array
	 */
	protected $registered_section_types = array();

	/**
	 * Control types that may be rendered from JS templates.
	 *
	 * @since 4.1.0
	 * @access protected
	 * @var array
	 */
	protected $registered_control_types = array();

	/**
	 * Initial URL being previewed.
	 *
	 * @since 4.4.0
	 * @access protected
	 * @var string
	 */
	protected $preview_url;

	/**
	 * URL to link the user to when closing the Customizer.
	 *
	 * @since 4.4.0
	 * @access protected
	 * @var string
	 */
	protected $return_url;

	/**
	 * Mapping of 'panel', 'section', 'control' to the ID which should be autofocused.
	 *
	 * @since 4.4.0
	 * @access protected
	 * @var array
	 */
	protected $autofocus = array();

	/**
	 * Messenger channel.
	 *
	 * @since 4.7.0
	 * @access protected
	 * @var string
	 */
	protected $messenger_channel;

	/**
	 * Unsanitized values for Customize Settings parsed from $_POST['customized'].
	 *
	 * @var array
	 */
	private $_post_values;

	/**
	 * Changeset UUID.
	 *
	 * @since 4.7.0
	 * @access private
	 * @var string
	 */
	private $_changeset_uuid;

	/**
	 * Changeset post ID.
	 *
	 * @since 4.7.0
	 * @access private
	 * @var int|false
	 */
	private $_changeset_post_id;

	/**
	 * Changeset data loaded from a customize_changeset post.
	 *
	 * @since 4.7.0
	 * @access private
	 * @var array
	 */
	private $_changeset_data;

	/**
	 * Constructor.
	 *
	 * @since 3.4.0
	 * @since 4.7.0 Added $args param.
	 *
	 * @param array $args {
	 *     Args.
	 *
	 *     @type string $changeset_uuid    Changeset UUID, the post_name for the customize_changeset post containing the customized state. Defaults to new UUID.
	 *     @type string $theme             Theme to be previewed (for theme switch). Defaults to customize_theme or theme query params.
	 *     @type string $messenger_channel Messenger channel. Defaults to customize_messenger_channel query param.
	 * }
	 */
	public function __construct( $args = array() ) {

		$args = array_merge(
			array_fill_keys( array( 'changeset_uuid', 'theme', 'messenger_channel' ), null ),
			$args
		);

		// Note that the UUID format will be validated in the setup_theme() method.
		if ( ! isset( $args['changeset_uuid'] ) ) {
			$args['changeset_uuid'] = wp_generate_uuid4();
		}

		// The theme and messenger_channel should be supplied via $args, but they are also looked at in the $_REQUEST global here for back-compat.
		if ( ! isset( $args['theme'] ) ) {
			if ( isset( $_REQUEST['customize_theme'] ) ) {
				$args['theme'] = wp_unslash( $_REQUEST['customize_theme'] );
			} elseif ( isset( $_REQUEST['theme'] ) ) { // Deprecated.
				$args['theme'] = wp_unslash( $_REQUEST['theme'] );
			}
		}
		if ( ! isset( $args['messenger_channel'] ) && isset( $_REQUEST['customize_messenger_channel'] ) ) {
			$args['messenger_channel'] = sanitize_key( wp_unslash( $_REQUEST['customize_messenger_channel'] ) );
		}

		$this->original_stylesheet = get_stylesheet();
		$this->theme = wp_get_theme( $args['theme'] );
		$this->messenger_channel = $args['messenger_channel'];
		$this->_changeset_uuid = $args['changeset_uuid'];

		require_once( ABSPATH . WPINC . '/class-wp-customize-setting.php' );
		require_once( ABSPATH . WPINC . '/class-wp-customize-panel.php' );
		require_once( ABSPATH . WPINC . '/class-wp-customize-section.php' );
		require_once( ABSPATH . WPINC . '/class-wp-customize-control.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-color-control.php' );
		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-media-control.php' );
		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-upload-control.php' );
		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-image-control.php' );
		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-background-image-control.php' );
		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-background-position-control.php' );
		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-cropped-image-control.php' );
		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-site-icon-control.php' );
		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-header-image-control.php' );
		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-theme-control.php' );
		require_once( ABSPATH . WPINC . '/customize/class-wp-widget-area-customize-control.php' );
		require_once( ABSPATH . WPINC . '/customize/class-wp-widget-form-customize-control.php' );
		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-control.php' );
		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-item-control.php' );
		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-location-control.php' );
		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-name-control.php' );
		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-auto-add-control.php' );
		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-new-menu-control.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menus-panel.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-themes-section.php' );
		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-sidebar-section.php' );
		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-section.php' );
		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-new-menu-section.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-custom-css-setting.php' );
		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-filter-setting.php' );
		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-header-image-setting.php' );
		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-background-image-setting.php' );
		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-item-setting.php' );
		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-setting.php' );

		/**
		 * Filters the core Customizer components to load.
		 *
		 * This allows Core components to be excluded from being instantiated by
		 * filtering them out of the array. Note that this filter generally runs
		 * during the {@see 'plugins_loaded'} action, so it cannot be added
		 * in a theme.
		 *
		 * @since 4.4.0
		 *
		 * @see WP_Customize_Manager::__construct()
		 *
		 * @param array                $components List of core components to load.
		 * @param WP_Customize_Manager $this       WP_Customize_Manager instance.
		 */
		$components = apply_filters( 'customize_loaded_components', $this->components, $this );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-selective-refresh.php' );
		$this->selective_refresh = new WP_Customize_Selective_Refresh( $this );

		if ( in_array( 'widgets', $components, true ) ) {
			require_once( ABSPATH . WPINC . '/class-wp-customize-widgets.php' );
			$this->widgets = new WP_Customize_Widgets( $this );
		}

		if ( in_array( 'nav_menus', $components, true ) ) {
			require_once( ABSPATH . WPINC . '/class-wp-customize-nav-menus.php' );
			$this->nav_menus = new WP_Customize_Nav_Menus( $this );
		}

		add_action( 'setup_theme', array( $this, 'setup_theme' ) );
		add_action( 'wp_loaded',   array( $this, 'wp_loaded' ) );

		// Do not spawn cron (especially the alternate cron) while running the Customizer.
		remove_action( 'init', 'wp_cron' );

		// Do not run update checks when rendering the controls.
		remove_action( 'admin_init', '_maybe_update_core' );
		remove_action( 'admin_init', '_maybe_update_plugins' );
		remove_action( 'admin_init', '_maybe_update_themes' );

		add_action( 'wp_ajax_customize_save',           array( $this, 'save' ) );
		add_action( 'wp_ajax_customize_refresh_nonces', array( $this, 'refresh_nonces' ) );

		add_action( 'customize_register',                 array( $this, 'register_controls' ) );
		add_action( 'customize_register',                 array( $this, 'register_dynamic_settings' ), 11 ); // allow code to create settings first
		add_action( 'customize_controls_init',            array( $this, 'prepare_controls' ) );
		add_action( 'customize_controls_enqueue_scripts', array( $this, 'enqueue_control_scripts' ) );

		// Render Panel, Section, and Control templates.
		add_action( 'customize_controls_print_footer_scripts', array( $this, 'render_panel_templates' ), 1 );
		add_action( 'customize_controls_print_footer_scripts', array( $this, 'render_section_templates' ), 1 );
		add_action( 'customize_controls_print_footer_scripts', array( $this, 'render_control_templates' ), 1 );

		// Export header video settings with the partial response.
		add_filter( 'customize_render_partials_response', array( $this, 'export_header_video_settings' ), 10, 3 );

		// Export the settings to JS via the _wpCustomizeSettings variable.
		add_action( 'customize_controls_print_footer_scripts', array( $this, 'customize_pane_settings' ), 1000 );
	}

	/**
	 * Return true if it's an Ajax request.
	 *
	 * @since 3.4.0
	 * @since 4.2.0 Added `$action` param.
	 * @access public
	 *
	 * @param string|null $action Whether the supplied Ajax action is being run.
	 * @return bool True if it's an Ajax request, false otherwise.
	 */
	public function doing_ajax( $action = null ) {
		if ( ! wp_doing_ajax() ) {
			return false;
		}

		if ( ! $action ) {
			return true;
		} else {
			/*
			 * Note: we can't just use doing_action( "wp_ajax_{$action}" ) because we need
			 * to check before admin-ajax.php gets to that point.
			 */
			return isset( $_REQUEST['action'] ) && wp_unslash( $_REQUEST['action'] ) === $action;
		}
	}

	/**
	 * Custom wp_die wrapper. Returns either the standard message for UI
	 * or the Ajax message.
	 *
	 * @since 3.4.0
	 *
	 * @param mixed $ajax_message Ajax return
	 * @param mixed $message UI message
	 */
	protected function wp_die( $ajax_message, $message = null ) {
		if ( $this->doing_ajax() ) {
			wp_die( $ajax_message );
		}

		if ( ! $message ) {
			$message = __( 'Cheatin’ uh?' );
		}

		if ( $this->messenger_channel ) {
			ob_start();
			wp_enqueue_scripts();
			wp_print_scripts( array( 'customize-base' ) );

			$settings = array(
				'messengerArgs' => array(
					'channel' => $this->messenger_channel,
					'url' => wp_customize_url(),
				),
				'error' => $ajax_message,
			);
			?>
			<script>
			( function( api, settings ) {
				var preview = new api.Messenger( settings.messengerArgs );
				preview.send( 'iframe-loading-error', settings.error );
			} )( wp.customize, <?php echo wp_json_encode( $settings ) ?> );
			</script>
			<?php
			$message .= ob_get_clean();
		}

		wp_die( $message );
	}

	/**
	 * Return the Ajax wp_die() handler if it's a customized request.
	 *
	 * @since 3.4.0
	 * @deprecated 4.7.0
	 *
	 * @return callable Die handler.
	 */
	public function wp_die_handler() {
		_deprecated_function( __METHOD__, '4.7.0' );

		if ( $this->doing_ajax() || isset( $_POST['customized'] ) ) {
			return '_ajax_wp_die_handler';
		}

		return '_default_wp_die_handler';
	}

	/**
	 * Start preview and customize theme.
	 *
	 * Check if customize query variable exist. Init filters to filter the current theme.
	 *
	 * @since 3.4.0
	 *
	 * @global string $pagenow
	 */
	public function setup_theme() {
		global $pagenow;

		// Check permissions for customize.php access since this method is called before customize.php can run any code,
		if ( 'customize.php' === $pagenow && ! current_user_can( 'customize' ) ) {
			if ( ! is_user_logged_in() ) {
				auth_redirect();
			} else {
				wp_die(
					'<h1>' . __( 'Cheatin’ uh?' ) . '</h1>' .
					'<p>' . __( 'Sorry, you are not allowed to customize this site.' ) . '</p>',
					403
				);
			}
			return;
		}

		if ( ! preg_match( '/^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/', $this->_changeset_uuid ) ) {
			$this->wp_die( -1, __( 'Invalid changeset UUID' ) );
		}

		/*
		 * Clear incoming post data if the user lacks a CSRF token (nonce). Note that the customizer
		 * application will inject the customize_preview_nonce query parameter into all Ajax requests.
		 * For similar behavior elsewhere in WordPress, see rest_cookie_check_errors() which logs out
		 * a user when a valid nonce isn't present.
		 */
		$has_post_data_nonce = (
			check_ajax_referer( 'preview-customize_' . $this->get_stylesheet(), 'nonce', false )
			||
			check_ajax_referer( 'save-customize_' . $this->get_stylesheet(), 'nonce', false )
			||
			check_ajax_referer( 'preview-customize_' . $this->get_stylesheet(), 'customize_preview_nonce', false )
		);
		if ( ! current_user_can( 'customize' ) || ! $has_post_data_nonce ) {
			unset( $_POST['customized'] );
			unset( $_REQUEST['customized'] );
		}

		/*
		 * If unauthenticated then require a valid changeset UUID to load the preview.
		 * In this way, the UUID serves as a secret key. If the messenger channel is present,
		 * then send unauthenticated code to prompt re-auth.
		 */
		if ( ! current_user_can( 'customize' ) && ! $this->changeset_post_id() ) {
			$this->wp_die( $this->messenger_channel ? 0 : -1, __( 'Non-existent changeset UUID.' ) );
		}

		if ( ! headers_sent() ) {
			send_origin_headers();
		}

		// Hide the admin bar if we're embedded in the customizer iframe.
		if ( $this->messenger_channel ) {
			show_admin_bar( false );
		}

		if ( $this->is_theme_active() ) {
			// Once the theme is loaded, we'll validate it.
			add_action( 'after_setup_theme', array( $this, 'after_setup_theme' ) );
		} else {
			// If the requested theme is not the active theme and the user doesn't have the
			// switch_themes cap, bail.
			if ( ! current_user_can( 'switch_themes' ) ) {
				$this->wp_die( -1, __( 'Sorry, you are not allowed to edit theme options on this site.' ) );
			}

			// If the theme has errors while loading, bail.
			if ( $this->theme()->errors() ) {
				$this->wp_die( -1, $this->theme()->errors()->get_error_message() );
			}

			// If the theme isn't allowed per multisite settings, bail.
			if ( ! $this->theme()->is_allowed() ) {
				$this->wp_die( -1, __( 'The requested theme does not exist.' ) );
			}
		}

		/*
		 * Import theme starter content for fresh installs when landing in the customizer.
		 * Import starter content at after_setup_theme:100 so that any
		 * add_theme_support( 'starter-content' ) calls will have been made.
		 */
		if ( get_option( 'fresh_site' ) && 'customize.php' === $pagenow ) {
			add_action( 'after_setup_theme', array( $this, 'import_theme_starter_content' ), 100 );
		}

		$this->start_previewing_theme();
	}

	/**
	 * Callback to validate a theme once it is loaded
	 *
	 * @since 3.4.0
	 */
	public function after_setup_theme() {
		$doing_ajax_or_is_customized = ( $this->doing_ajax() || isset( $_POST['customized'] ) );
		if ( ! $doing_ajax_or_is_customized && ! validate_current_theme() ) {
			wp_redirect( 'themes.php?broken=true' );
			exit;
		}
	}

	/**
	 * If the theme to be previewed isn't the active theme, add filter callbacks
	 * to swap it out at runtime.
	 *
	 * @since 3.4.0
	 */
	public function start_previewing_theme() {
		// Bail if we're already previewing.
		if ( $this->is_preview() ) {
			return;
		}

		$this->previewing = true;

		if ( ! $this->is_theme_active() ) {
			add_filter( 'template', array( $this, 'get_template' ) );
			add_filter( 'stylesheet', array( $this, 'get_stylesheet' ) );
			add_filter( 'pre_option_current_theme', array( $this, 'current_theme' ) );

			// @link: https://core.trac.wordpress.org/ticket/20027
			add_filter( 'pre_option_stylesheet', array( $this, 'get_stylesheet' ) );
			add_filter( 'pre_option_template', array( $this, 'get_template' ) );

			// Handle custom theme roots.
			add_filter( 'pre_option_stylesheet_root', array( $this, 'get_stylesheet_root' ) );
			add_filter( 'pre_option_template_root', array( $this, 'get_template_root' ) );
		}

		/**
		 * Fires once the Customizer theme preview has started.
		 *
		 * @since 3.4.0
		 *
		 * @param WP_Customize_Manager $this WP_Customize_Manager instance.
		 */
		do_action( 'start_previewing_theme', $this );
	}

	/**
	 * Stop previewing the selected theme.
	 *
	 * Removes filters to change the current theme.
	 *
	 * @since 3.4.0
	 */
	public function stop_previewing_theme() {
		if ( ! $this->is_preview() ) {
			return;
		}

		$this->previewing = false;

		if ( ! $this->is_theme_active() ) {
			remove_filter( 'template', array( $this, 'get_template' ) );
			remove_filter( 'stylesheet', array( $this, 'get_stylesheet' ) );
			remove_filter( 'pre_option_current_theme', array( $this, 'current_theme' ) );

			// @link: https://core.trac.wordpress.org/ticket/20027
			remove_filter( 'pre_option_stylesheet', array( $this, 'get_stylesheet' ) );
			remove_filter( 'pre_option_template', array( $this, 'get_template' ) );

			// Handle custom theme roots.
			remove_filter( 'pre_option_stylesheet_root', array( $this, 'get_stylesheet_root' ) );
			remove_filter( 'pre_option_template_root', array( $this, 'get_template_root' ) );
		}

		/**
		 * Fires once the Customizer theme preview has stopped.
		 *
		 * @since 3.4.0
		 *
		 * @param WP_Customize_Manager $this WP_Customize_Manager instance.
		 */
		do_action( 'stop_previewing_theme', $this );
	}

	/**
	 * Get the changeset UUID.
	 *
	 * @since 4.7.0
	 * @access public
	 *
	 * @return string UUID.
	 */
	public function changeset_uuid() {
		return $this->_changeset_uuid;
	}

	/**
	 * Get the theme being customized.
	 *
	 * @since 3.4.0
	 *
	 * @return WP_Theme
	 */
	public function theme() {
		if ( ! $this->theme ) {
			$this->theme = wp_get_theme();
		}
		return $this->theme;
	}

	/**
	 * Get the registered settings.
	 *
	 * @since 3.4.0
	 *
	 * @return array
	 */
	public function settings() {
		return $this->settings;
	}

	/**
	 * Get the registered controls.
	 *
	 * @since 3.4.0
	 *
	 * @return array
	 */
	public function controls() {
		return $this->controls;
	}

	/**
	 * Get the registered containers.
	 *
	 * @since 4.0.0
	 *
	 * @return array
	 */
	public function containers() {
		return $this->containers;
	}

	/**
	 * Get the registered sections.
	 *
	 * @since 3.4.0
	 *
	 * @return array
	 */
	public function sections() {
		return $this->sections;
	}

	/**
	 * Get the registered panels.
	 *
	 * @since 4.0.0
	 * @access public
	 *
	 * @return array Panels.
	 */
	public function panels() {
		return $this->panels;
	}

	/**
	 * Checks if the current theme is active.
	 *
	 * @since 3.4.0
	 *
	 * @return bool
	 */
	public function is_theme_active() {
		return $this->get_stylesheet() == $this->original_stylesheet;
	}

	/**
	 * Register styles/scripts and initialize the preview of each setting
	 *
	 * @since 3.4.0
	 */
	public function wp_loaded() {

		/**
		 * Fires once WordPress has loaded, allowing scripts and styles to be initialized.
		 *
		 * @since 3.4.0
		 *
		 * @param WP_Customize_Manager $this WP_Customize_Manager instance.
		 */
		do_action( 'customize_register', $this );

		/*
		 * Note that settings must be previewed here even outside the customizer preview
		 * and also in the customizer pane itself. This is to enable loading an existing
		 * changeset into the customizer. Previewing the settings only has to be prevented
		 * in the case of a customize_save action because then update_option()
		 * may short-circuit because it will detect that there are no changes to
		 * make.
		 */
		if ( ! $this->doing_ajax( 'customize_save' ) ) {
			foreach ( $this->settings as $setting ) {
				$setting->preview();
			}
		}

		if ( $this->is_preview() && ! is_admin() ) {
			$this->customize_preview_init();
		}
	}

	/**
	 * Prevents Ajax requests from following redirects when previewing a theme
	 * by issuing a 200 response instead of a 30x.
	 *
	 * Instead, the JS will sniff out the location header.
	 *
	 * @since 3.4.0
	 * @deprecated 4.7.0
	 *
	 * @param int $status Status.
	 * @return int
	 */
	public function wp_redirect_status( $status ) {
		_deprecated_function( __FUNCTION__, '4.7.0' );

		if ( $this->is_preview() && ! is_admin() ) {
			return 200;
		}

		return $status;
	}

	/**
	 * Find the changeset post ID for a given changeset UUID.
	 *
	 * @since 4.7.0
	 * @access public
	 *
	 * @param string $uuid Changeset UUID.
	 * @return int|null Returns post ID on success and null on failure.
	 */
	public function find_changeset_post_id( $uuid ) {
		$cache_group = 'customize_changeset_post';
		$changeset_post_id = wp_cache_get( $uuid, $cache_group );
		if ( $changeset_post_id && 'customize_changeset' === get_post_type( $changeset_post_id ) ) {
			return $changeset_post_id;
		}

		$changeset_post_query = new WP_Query( array(
			'post_type' => 'customize_changeset',
			'post_status' => get_post_stati(),
			'name' => $uuid,
			'posts_per_page' => 1,
			'no_found_rows' => true,
			'cache_results' => true,
			'update_post_meta_cache' => false,
			'update_post_term_cache' => false,
			'lazy_load_term_meta' => false,
		) );
		if ( ! empty( $changeset_post_query->posts ) ) {
			// Note: 'fields'=>'ids' is not being used in order to cache the post object as it will be needed.
			$changeset_post_id = $changeset_post_query->posts[0]->ID;
			wp_cache_set( $this->_changeset_uuid, $changeset_post_id, $cache_group );
			return $changeset_post_id;
		}

		return null;
	}

	/**
	 * Get the changeset post id for the loaded changeset.
	 *
	 * @since 4.7.0
	 * @access public
	 *
	 * @return int|null Post ID on success or null if there is no post yet saved.
	 */
	public function changeset_post_id() {
		if ( ! isset( $this->_changeset_post_id ) ) {
			$post_id = $this->find_changeset_post_id( $this->_changeset_uuid );
			if ( ! $post_id ) {
				$post_id = false;
			}
			$this->_changeset_post_id = $post_id;
		}
		if ( false === $this->_changeset_post_id ) {
			return null;
		}
		return $this->_changeset_post_id;
	}

	/**
	 * Get the data stored in a changeset post.
	 *
	 * @since 4.7.0
	 * @access protected
	 *
	 * @param int $post_id Changeset post ID.
	 * @return array|WP_Error Changeset data or WP_Error on error.
	 */
	protected function get_changeset_post_data( $post_id ) {
		if ( ! $post_id ) {
			return new WP_Error( 'empty_post_id' );
		}
		$changeset_post = get_post( $post_id );
		if ( ! $changeset_post ) {
			return new WP_Error( 'missing_post' );
		}
		if ( 'customize_changeset' !== $changeset_post->post_type ) {
			return new WP_Error( 'wrong_post_type' );
		}
		$changeset_data = json_decode( $changeset_post->post_content, true );
		if ( function_exists( 'json_last_error' ) && json_last_error() ) {
			return new WP_Error( 'json_parse_error', '', json_last_error() );
		}
		if ( ! is_array( $changeset_data ) ) {
			return new WP_Error( 'expected_array' );
		}
		return $changeset_data;
	}

	/**
	 * Get changeset data.
	 *
	 * @since 4.7.0
	 * @access public
	 *
	 * @return array Changeset data.
	 */
	public function changeset_data() {
		if ( isset( $this->_changeset_data ) ) {
			return $this->_changeset_data;
		}
		$changeset_post_id = $this->changeset_post_id();
		if ( ! $changeset_post_id ) {
			$this->_changeset_data = array();
		} else {
			$data = $this->get_changeset_post_data( $changeset_post_id );
			if ( ! is_wp_error( $data ) ) {
				$this->_changeset_data = $data;
			} else {
				$this->_changeset_data = array();
			}
		}
		return $this->_changeset_data;
	}

	/**
	 * Starter content setting IDs.
	 *
	 * @since 4.7.0
	 * @access private
	 * @var array
	 */
	protected $pending_starter_content_settings_ids = array();

	/**
	 * Import theme starter content into the customized state.
	 *
	 * @since 4.7.0
	 * @access public
	 *
	 * @param array $starter_content Starter content. Defaults to `get_theme_starter_content()`.
	 */
	function import_theme_starter_content( $starter_content = array() ) {
		if ( empty( $starter_content ) ) {
			$starter_content = get_theme_starter_content();
		}

		$changeset_data = array();
		if ( $this->changeset_post_id() ) {
			$changeset_data = $this->get_changeset_post_data( $this->changeset_post_id() );
		}

		$sidebars_widgets = isset( $starter_content['widgets'] ) && ! empty( $this->widgets ) ? $starter_content['widgets'] : array();
		$attachments = isset( $starter_content['attachments'] ) && ! empty( $this->nav_menus ) ? $starter_content['attachments'] : array();
		$posts = isset( $starter_content['posts'] ) && ! empty( $this->nav_menus ) ? $starter_content['posts'] : array();
		$options = isset( $starter_content['options'] ) ? $starter_content['options'] : array();
		$nav_menus = isset( $starter_content['nav_menus'] ) && ! empty( $this->nav_menus ) ? $starter_content['nav_menus'] : array();
		$theme_mods = isset( $starter_content['theme_mods'] ) ? $starter_content['theme_mods'] : array();

		// Widgets.
		$max_widget_numbers = array();
		foreach ( $sidebars_widgets as $sidebar_id => $widgets ) {
			$sidebar_widget_ids = array();
			foreach ( $widgets as $widget ) {
				list( $id_base, $instance ) = $widget;

				if ( ! isset( $max_widget_numbers[ $id_base ] ) ) {

					// When $settings is an array-like object, get an intrinsic array for use with array_keys().
					$settings = get_option( "widget_{$id_base}", array() );
					if ( $settings instanceof ArrayObject || $settings instanceof ArrayIterator ) {
$settings = $settings->getArrayCopy();
					}

					// Find the max widget number for this type.
					$widget_numbers = array_keys( $settings );
					if ( count( $widget_numbers ) > 0 ) {
$widget_numbers[] = 1;
$max_widget_numbers[ $id_base ] = call_user_func_array( 'max', $widget_numbers );
					} else {
$max_widget_numbers[ $id_base ] = 1;
					}
				}
				$max_widget_numbers[ $id_base ] += 1;

				$widget_id = sprintf( '%s-%d', $id_base, $max_widget_numbers[ $id_base ] );
				$setting_id = sprintf( 'widget_%s[%d]', $id_base, $max_widget_numbers[ $id_base ] );

				$setting_value = $this->widgets->sanitize_widget_js_instance( $instance );
				if ( empty( $changeset_data[ $setting_id ] ) || ! empty( $changeset_data[ $setting_id ]['starter_content'] ) ) {
					$this->set_post_value( $setting_id, $setting_value );
					$this->pending_starter_content_settings_ids[] = $setting_id;
				}
				$sidebar_widget_ids[] = $widget_id;
			}

			$setting_id = sprintf( 'sidebars_widgets[%s]', $sidebar_id );
			if ( empty( $changeset_data[ $setting_id ] ) || ! empty( $changeset_data[ $setting_id ]['starter_content'] ) ) {
				$this->set_post_value( $setting_id, $sidebar_widget_ids );
				$this->pending_starter_content_settings_ids[] = $setting_id;
			}
		}

		$starter_content_auto_draft_post_ids = array();
		if ( ! empty( $changeset_data['nav_menus_created_posts']['value'] ) ) {
			$starter_content_auto_draft_post_ids = array_merge( $starter_content_auto_draft_post_ids, $changeset_data['nav_menus_created_posts']['value'] );
		}

		// Make an index of all the posts needed and what their slugs are.
		$needed_posts = array();
		$attachments = $this->prepare_starter_content_attachments( $attachments );
		foreach ( $attachments as $attachment ) {
			$key = 'attachment:' . $attachment['post_name'];
			$needed_posts[ $key ] = true;
		}
		foreach ( array_keys( $posts ) as $post_symbol ) {
			if ( empty( $posts[ $post_symbol ]['post_name'] ) && empty( $posts[ $post_symbol ]['post_title'] ) ) {
				unset( $posts[ $post_symbol ] );
				continue;
			}
			if ( empty( $posts[ $post_symbol ]['post_name'] ) ) {
				$posts[ $post_symbol ]['post_name'] = sanitize_title( $posts[ $post_symbol ]['post_title'] );
			}
			if ( empty( $posts[ $post_symbol ]['post_type'] ) ) {
				$posts[ $post_symbol ]['post_type'] = 'post';
			}
			$needed_posts[ $posts[ $post_symbol ]['post_type'] . ':' . $posts[ $post_symbol ]['post_name'] ] = true;
		}
		$all_post_slugs = array_merge(
			wp_list_pluck( $attachments, 'post_name' ),
			wp_list_pluck( $posts, 'post_name' )
		);

		/*
		 * Obtain all post types referenced in starter content to use in query.
		 * This is needed because 'any' will not account for post types not yet registered.
		 */
		$post_types = array_filter( array_merge( array( 'attachment' ), wp_list_pluck( $posts, 'post_type' ) ) );

		// Re-use auto-draft starter content posts referenced in the current customized state.
		$existing_starter_content_posts = array();
		if ( ! empty( $starter_content_auto_draft_post_ids ) ) {
			$existing_posts_query = new WP_Query( array(
				'post__in' => $starter_content_auto_draft_post_ids,
				'post_status' => 'auto-draft',
				'post_type' => $post_types,
				'posts_per_page' => -1,
			) );
			foreach ( $existing_posts_query->posts as $existing_post ) {
				$post_name = $existing_post->post_name;
				if ( empty( $post_name ) ) {
					$post_name = get_post_meta( $existing_post->ID, '_customize_draft_post_name', true );
				}
				$existing_starter_content_posts[ $existing_post->post_type . ':' . $post_name ] = $existing_post;
			}
		}

		// Re-use non-auto-draft posts.
		if ( ! empty( $all_post_slugs ) ) {
			$existing_posts_query = new WP_Query( array(
				'post_name__in' => $all_post_slugs,
				'post_status' => array_diff( get_post_stati(), array( 'auto-draft' ) ),
				'post_type' => 'any',
				'posts_per_page' => -1,
			) );
			foreach ( $existing_posts_query->posts as $existing_post ) {
				$key = $existing_post->post_type . ':' . $existing_post->post_name;
				if ( isset( $needed_posts[ $key ] ) && ! isset( $existing_starter_content_posts[ $key ] ) ) {
					$existing_starter_content_posts[ $key ] = $existing_post;
				}
			}
		}

		// Attachments are technically posts but handled differently.
		if ( ! empty( $attachments ) ) {

			$attachment_ids = array();

			foreach ( $attachments as $symbol => $attachment ) {
				$file_array = array(
					'name' => $attachment['file_name'],
				);
				$file_path = $attachment['file_path'];
				$attachment_id = null;
				$attached_file = null;
				if ( isset( $existing_starter_content_posts[ 'attachment:' . $attachment['post_name'] ] ) ) {
					$attachment_post = $existing_starter_content_posts[ 'attachment:' . $attachment['post_name'] ];
					$attachment_id = $attachment_post->ID;
					$attached_file = get_attached_file( $attachment_id );
					if ( empty( $attached_file ) || ! file_exists( $attached_file ) ) {
$attachment_id = null;
$attached_file = null;
					} elseif ( $this->get_stylesheet() !== get_post_meta( $attachment_post->ID, '_starter_content_theme', true ) ) {

// Re-generate attachment metadata since it was previously generated for a different theme.
$metadata = wp_generate_attachment_metadata( $attachment_post->ID, $attached_file );
wp_update_attachment_metadata( $attachment_id, $metadata );
update_post_meta( $attachment_id, '_starter_content_theme', $this->get_stylesheet() );
					}
				}

				// Insert the attachment auto-draft because it doesn't yet exist or the attached file is gone.
				if ( ! $attachment_id ) {

					// Copy file to temp location so that original file won't get deleted from theme after sideloading.
					$temp_file_name = wp_tempnam( basename( $file_path ) );
					if ( $temp_file_name && copy( $file_path, $temp_file_name ) ) {
$file_array['tmp_name'] = $temp_file_name;
					}
					if ( empty( $file_array['tmp_name'] ) ) {
continue;
					}

					$attachment_post_data = array_merge(
wp_array_slice_assoc( $attachment, array( 'post_title', 'post_content', 'post_excerpt' ) ),
array(
'post_status' => 'auto-draft', // So attachment will be garbage collected in a week if changeset is never published.
)
					);

					// In PHP < 5.6 filesize() returns 0 for the temp files unless we clear the file status cache.
					// Technically, PHP < 5.6.0 || < 5.5.13 || < 5.4.29 but no need to be so targeted.
					// See https://bugs.php.net/bug.php?id=65701
					if ( version_compare( PHP_VERSION, '5.6', '<' ) ) {
clearstatcache();
					}

					$attachment_id = media_handle_sideload( $file_array, 0, null, $attachment_post_data );
					if ( is_wp_error( $attachment_id ) ) {
continue;
					}
					update_post_meta( $attachment_id, '_starter_content_theme', $this->get_stylesheet() );
					update_post_meta( $attachment_id, '_customize_draft_post_name', $attachment['post_name'] );
				}

				$attachment_ids[ $symbol ] = $attachment_id;
			}
			$starter_content_auto_draft_post_ids = array_merge( $starter_content_auto_draft_post_ids, array_values( $attachment_ids ) );
		}

		// Posts & pages.
		if ( ! empty( $posts ) ) {
			foreach ( array_keys( $posts ) as $post_symbol ) {
				if ( empty( $posts[ $post_symbol ]['post_type'] ) || empty( $posts[ $post_symbol ]['post_name'] ) ) {
					continue;
				}
				$post_type = $posts[ $post_symbol ]['post_type'];
				if ( ! empty( $posts[ $post_symbol ]['post_name'] ) ) {
					$post_name = $posts[ $post_symbol ]['post_name'];
				} elseif ( ! empty( $posts[ $post_symbol ]['post_title'] ) ) {
					$post_name = sanitize_title( $posts[ $post_symbol ]['post_title'] );
				} else {
					continue;
				}

				// Use existing auto-draft post if one already exists with the same type and name.
				if ( isset( $existing_starter_content_posts[ $post_type . ':' . $post_name ] ) ) {
					$posts[ $post_symbol ]['ID'] = $existing_starter_content_posts[ $post_type . ':' . $post_name ]->ID;
					continue;
				}

				// Translate the featured image symbol.
				if ( ! empty( $posts[ $post_symbol ]['thumbnail'] )
					&& preg_match( '/^{{(?P<symbol>.+)}}$/', $posts[ $post_symbol ]['thumbnail'], $matches )
					&& isset( $attachment_ids[ $matches['symbol'] ] ) ) {
					$posts[ $post_symbol ]['meta_input']['_thumbnail_id'] = $attachment_ids[ $matches['symbol'] ];
				}

				if ( ! empty( $posts[ $post_symbol ]['template'] ) ) {
					$posts[ $post_symbol ]['meta_input']['_wp_page_template'] = $posts[ $post_symbol ]['template'];
				}

				$r = $this->nav_menus->insert_auto_draft_post( $posts[ $post_symbol ] );
				if ( $r instanceof WP_Post ) {
					$posts[ $post_symbol ]['ID'] = $r->ID;
				}
			}

			$starter_content_auto_draft_post_ids = array_merge( $starter_content_auto_draft_post_ids, wp_list_pluck( $posts, 'ID' ) );
		}

		// The nav_menus_created_posts setting is why nav_menus component is dependency for adding posts.
		if ( ! empty( $this->nav_menus ) && ! empty( $starter_content_auto_draft_post_ids ) ) {
			$setting_id = 'nav_menus_created_posts';
			$this->set_post_value( $setting_id, array_unique( array_values( $starter_content_auto_draft_post_ids ) ) );
			$this->pending_starter_content_settings_ids[] = $setting_id;
		}

		// Nav menus.
		$placeholder_id = -1;
		$reused_nav_menu_setting_ids = array();
		foreach ( $nav_menus as $nav_menu_location => $nav_menu ) {

			$nav_menu_term_id = null;
			$nav_menu_setting_id = null;
			$matches = array();

			// Look for an existing placeholder menu with starter content to re-use.
			foreach ( $changeset_data as $setting_id => $setting_params ) {
				$can_reuse = (
					! empty( $setting_params['starter_content'] )
					&&
					! in_array( $setting_id, $reused_nav_menu_setting_ids, true )
					&&
					preg_match( '#^nav_menu\[(?P<nav_menu_id>-?\d+)\]$#', $setting_id, $matches )
				);
				if ( $can_reuse ) {
					$nav_menu_term_id = intval( $matches['nav_menu_id'] );
					$nav_menu_setting_id = $setting_id;
					$reused_nav_menu_setting_ids[] = $setting_id;
					break;
				}
			}

			if ( ! $nav_menu_term_id ) {
				while ( isset( $changeset_data[ sprintf( 'nav_menu[%d]', $placeholder_id ) ] ) ) {
					$placeholder_id--;
				}
				$nav_menu_term_id = $placeholder_id;
				$nav_menu_setting_id = sprintf( 'nav_menu[%d]', $placeholder_id );
			}

			$this->set_post_value( $nav_menu_setting_id, array(
				'name' => isset( $nav_menu['name'] ) ? $nav_menu['name'] : $nav_menu_location,
			) );
			$this->pending_starter_content_settings_ids[] = $nav_menu_setting_id;

			// @todo Add support for menu_item_parent.
			$position = 0;
			foreach ( $nav_menu['items'] as $nav_menu_item ) {
				$nav_menu_item_setting_id = sprintf( 'nav_menu_item[%d]', $placeholder_id-- );
				if ( ! isset( $nav_menu_item['position'] ) ) {
					$nav_menu_item['position'] = $position++;
				}
				$nav_menu_item['nav_menu_term_id'] = $nav_menu_term_id;

				if ( isset( $nav_menu_item['object_id'] ) ) {
					if ( 'post_type' === $nav_menu_item['type'] && preg_match( '/^{{(?P<symbol>.+)}}$/', $nav_menu_item['object_id'], $matches ) && isset( $posts[ $matches['symbol'] ] ) ) {
$nav_menu_item['object_id'] = $posts[ $matches['symbol'] ]['ID'];
if ( empty( $nav_menu_item['title'] ) ) {
$original_object = get_post( $nav_menu_item['object_id'] );
$nav_menu_item['title'] = $original_object->post_title;
}
					} else {
continue;
					}
				} else {
					$nav_menu_item['object_id'] = 0;
				}

				if ( empty( $changeset_data[ $nav_menu_item_setting_id ] ) || ! empty( $changeset_data[ $nav_menu_item_setting_id ]['starter_content'] ) ) {
					$this->set_post_value( $nav_menu_item_setting_id, $nav_menu_item );
					$this->pending_starter_content_settings_ids[] = $nav_menu_item_setting_id;
				}
			}

			$setting_id = sprintf( 'nav_menu_locations[%s]', $nav_menu_location );
			if ( empty( $changeset_data[ $setting_id ] ) || ! empty( $changeset_data[ $setting_id ]['starter_content'] ) ) {
				$this->set_post_value( $setting_id, $nav_menu_term_id );
				$this->pending_starter_content_settings_ids[] = $setting_id;
			}
		}

		// Options.
		foreach ( $options as $name => $value ) {
			if ( preg_match( '/^{{(?P<symbol>.+)}}$/', $value, $matches ) ) {
				if ( isset( $posts[ $matches['symbol'] ] ) ) {
					$value = $posts[ $matches['symbol'] ]['ID'];
				} elseif ( isset( $attachment_ids[ $matches['symbol'] ] ) ) {
					$value = $attachment_ids[ $matches['symbol'] ];
				} else {
					continue;
				}
			}

			if ( empty( $changeset_data[ $name ] ) || ! empty( $changeset_data[ $name ]['starter_content'] ) ) {
				$this->set_post_value( $name, $value );
				$this->pending_starter_content_settings_ids[] = $name;
			}
		}

		// Theme mods.
		foreach ( $theme_mods as $name => $value ) {
			if ( preg_match( '/^{{(?P<symbol>.+)}}$/', $value, $matches ) ) {
				if ( isset( $posts[ $matches['symbol'] ] ) ) {
					$value = $posts[ $matches['symbol'] ]['ID'];
				} elseif ( isset( $attachment_ids[ $matches['symbol'] ] ) ) {
					$value = $attachment_ids[ $matches['symbol'] ];
				} else {
					continue;
				}
			}

			// Handle header image as special case since setting has a legacy format.
			if ( 'header_image' === $name ) {
				$name = 'header_image_data';
				$metadata = wp_get_attachment_metadata( $value );
				if ( empty( $metadata ) ) {
					continue;
				}
				$value = array(
					'attachment_id' => $value,
					'url' => wp_get_attachment_url( $value ),
					'height' => $metadata['height'],
					'width' => $metadata['width'],
				);
			} elseif ( 'background_image' === $name ) {
				$value = wp_get_attachment_url( $value );
			}

			if ( empty( $changeset_data[ $name ] ) || ! empty( $changeset_data[ $name ]['starter_content'] ) ) {
				$this->set_post_value( $name, $value );
				$this->pending_starter_content_settings_ids[] = $name;
			}
		}

		if ( ! empty( $this->pending_starter_content_settings_ids ) ) {
			if ( did_action( 'customize_register' ) ) {
				$this->_save_starter_content_changeset();
			} else {
				add_action( 'customize_register', array( $this, '_save_starter_content_changeset' ), 1000 );
			}
		}
	}

	/**
	 * Prepare starter content attachments.
	 *
	 * Ensure that the attachments are valid and that they have slugs and file name/path.
	 *
	 * @since 4.7.0
	 * @access private
	 *
	 * @param array $attachments Attachments.
	 * @return array Prepared attachments.
	 */
	protected function prepare_starter_content_attachments( $attachments ) {
		$prepared_attachments = array();
		if ( empty( $attachments ) ) {
			return $prepared_attachments;
		}

		// Such is The WordPress Way.
		require_once( ABSPATH . 'wp-admin/includes/file.php' );
		require_once( ABSPATH . 'wp-admin/includes/media.php' );
		require_once( ABSPATH . 'wp-admin/includes/image.php' );

		foreach ( $attachments as $symbol => $attachment ) {

			// A file is required and URLs to files are not currently allowed.
			if ( empty( $attachment['file'] ) || preg_match( '#^https?://$#', $attachment['file'] ) ) {
				continue;
			}

			$file_path = null;
			if ( file_exists( $attachment['file'] ) ) {
				$file_path = $attachment['file']; // Could be absolute path to file in plugin.
			} elseif ( is_child_theme() && file_exists( get_stylesheet_directory() . '/' . $attachment['file'] ) ) {
				$file_path = get_stylesheet_directory() . '/' . $attachment['file'];
			} elseif ( file_exists( get_template_directory() . '/' . $attachment['file'] ) ) {
				$file_path = get_template_directory() . '/' . $attachment['file'];
			} else {
				continue;
			}
			$file_name = basename( $attachment['file'] );

			// Skip file types that are not recognized.
			$checked_filetype = wp_check_filetype( $file_name );
			if ( empty( $checked_filetype['type'] ) ) {
				continue;
			}

			// Ensure post_name is set since not automatically derived from post_title for new auto-draft posts.
			if ( empty( $attachment['post_name'] ) ) {
				if ( ! empty( $attachment['post_title'] ) ) {
					$attachment['post_name'] = sanitize_title( $attachment['post_title'] );
				} else {
					$attachment['post_name'] = sanitize_title( preg_replace( '/\.\w+$/', '', $file_name ) );
				}
			}

			$attachment['file_name'] = $file_name;
			$attachment['file_path'] = $file_path;
			$prepared_attachments[ $symbol ] = $attachment;
		}
		return $prepared_attachments;
	}

	/**
	 * Save starter content changeset.
	 *
	 * @since 4.7.0
	 * @access private
	 */
	public function _save_starter_content_changeset() {

		if ( empty( $this->pending_starter_content_settings_ids ) ) {
			return;
		}

		$this->save_changeset_post( array(
			'data' => array_fill_keys( $this->pending_starter_content_settings_ids, array( 'starter_content' => true ) ),
			'starter_content' => true,
		) );

		$this->pending_starter_content_settings_ids = array();
	}

	/**
	 * Get dirty pre-sanitized setting values in the current customized state.
	 *
	 * The returned array consists of a merge of three 源代码s:
	 * 1. If the theme is not currently active, then the base array is any stashed
	 *    theme mods that were modified previously but never published.
	 * 2. The values from the current changeset, if it exists.
	 * 3. If the user can customize, the values parsed from the incoming
	 *    `$_POST['customized']` JSON data.
	 * 4. Any programmatically-set post values via `WP_Customize_Manager::set_post_value()`.
	 *
	 * The name "unsanitized_post_values" is a carry-over from when the customized
	 * state was exclusively 源代码d from `$_POST['customized']`. Nevertheless,
	 * the value returned will come from the current changeset post and from the
	 * incoming post data.
	 *
	 * @since 4.1.1
	 * @since 4.7.0 Added $args param and merging with changeset values and stashed theme mods.
	 *
	 * @param array $args {
	 *     Args.
	 *
	 *     @type bool $exclude_changeset Whether the changeset values should also be excluded. Defaults to false.
	 *     @type bool $exclude_post_data Whether the post input values should also be excluded. Defaults to false when lacking the customize capability.
	 * }
	 * @return array
	 */
	public function unsanitized_post_values( $args = array() ) {
		$args = array_merge(
			array(
				'exclude_changeset' => false,
				'exclude_post_data' => ! current_user_can( 'customize' ),
			),
			$args
		);

		$values = array();

		// Let default values be from the stashed theme mods if doing a theme switch and if no changeset is present.
		if ( ! $this->is_theme_active() ) {
			$stashed_theme_mods = get_option( 'customize_stashed_theme_mods' );
			$stylesheet = $this->get_stylesheet();
			if ( isset( $stashed_theme_mods[ $stylesheet ] ) ) {
				$values = array_merge( $values, wp_list_pluck( $stashed_theme_mods[ $stylesheet ], 'value' ) );
			}
		}

		if ( ! $args['exclude_changeset'] ) {
			foreach ( $this->changeset_data() as $setting_id => $setting_params ) {
				if ( ! array_key_exists( 'value', $setting_params ) ) {
					continue;
				}
				if ( isset( $setting_params['type'] ) && 'theme_mod' === $setting_params['type'] ) {

					// Ensure that theme mods values are only used if they were saved under the current theme.
					$namespace_pattern = '/^(?P<stylesheet>.+?)::(?P<setting_id>.+)$/';
					if ( preg_match( $namespace_pattern, $setting_id, $matches ) && $this->get_stylesheet() === $matches['stylesheet'] ) {
$values[ $matches['setting_id'] ] = $setting_params['value'];
					}
				} else {
					$values[ $setting_id ] = $setting_params['value'];
				}
			}
		}

		if ( ! $args['exclude_post_data'] ) {
			if ( ! isset( $this->_post_values ) ) {
				if ( isset( $_POST['customized'] ) ) {
					$post_values = json_decode( wp_unslash( $_POST['customized'] ), true );
				} else {
					$post_values = array();
				}
				if ( is_array( $post_values ) ) {
					$this->_post_values = $post_values;
				} else {
					$this->_post_values = array();
				}
			}
			$values = array_merge( $values, $this->_post_values );
		}
		return $values;
	}

	/**
	 * Returns the sanitized value for a given setting from the current customized state.
	 *
	 * The name "post_value" is a carry-over from when the customized state was exclusively
	 * 源代码d from `$_POST['customized']`. Nevertheless, the value returned will come
	 * from the current changeset post and from the incoming post data.
	 *
	 * @since 3.4.0
	 * @since 4.1.1 Introduced the `$default` parameter.
	 * @since 4.6.0 `$default` is now returned early when the setting post value is invalid.
	 * @access public
	 *
	 * @see WP_REST_Server::dispatch()
	 * @see WP_Rest_Request::sanitize_params()
	 * @see WP_Rest_Request::has_valid_params()
	 *
	 * @param WP_Customize_Setting $setting A WP_Customize_Setting derived object.
	 * @param mixed                $default Value returned $setting has no post value (added in 4.2.0)
	 *                                      or the post value is invalid (added in 4.6.0).
	 * @return string|mixed $post_value Sanitized value or the $default provided.
	 */
	public function post_value( $setting, $default = null ) {
		$post_values = $this->unsanitized_post_values();
		if ( ! array_key_exists( $setting->id, $post_values ) ) {
			return $default;
		}
		$value = $post_values[ $setting->id ];
		$valid = $setting->validate( $value );
		if ( is_wp_error( $valid ) ) {
			return $default;
		}
		$value = $setting->sanitize( $value );
		if ( is_null( $value ) || is_wp_error( $value ) ) {
			return $default;
		}
		return $value;
	}

	/**
	 * Override a setting's value in the current customized state.
	 *
	 * The name "post_value" is a carry-over from when the customized state was
	 * exclusively 源代码d from `$_POST['customized']`.
	 *
	 * @since 4.2.0
	 * @access public
	 *
	 * @param string $setting_id ID for the WP_Customize_Setting instance.
	 * @param mixed  $value      Post value.
	 */
	public function set_post_value( $setting_id, $value ) {
		$this->unsanitized_post_values(); // Populate _post_values from $_POST['customized'].
		$this->_post_values[ $setting_id ] = $value;

		/**
		 * Announce when a specific setting's unsanitized post value has been set.
		 *
		 * Fires when the WP_Customize_Manager::set_post_value() method is called.
		 *
		 * The dynamic portion of the hook name, `$setting_id`, refers to the setting ID.
		 *
		 * @since 4.4.0
		 *
		 * @param mixed                $value Unsanitized setting post value.
		 * @param WP_Customize_Manager $this  WP_Customize_Manager instance.
		 */
		do_action( "customize_post_value_set_{$setting_id}", $value, $this );

		/**
		 * Announce when any setting's unsanitized post value has been set.
		 *
		 * Fires when the WP_Customize_Manager::set_post_value() method is called.
		 *
		 * This is useful for `WP_Customize_Setting` instances to watch
		 * in order to update a cached previewed value.
		 *
		 * @since 4.4.0
		 *
		 * @param string               $setting_id Setting ID.
		 * @param mixed                $value      Unsanitized setting post value.
		 * @param WP_Customize_Manager $this       WP_Customize_Manager instance.
		 */
		do_action( 'customize_post_value_set', $setting_id, $value, $this );
	}

	/**
	 * Print JavaScript settings.
	 *
	 * @since 3.4.0
	 */
	public function customize_preview_init() {

		/*
		 * Now that Customizer previews are loaded into iframes via GET requests
		 * and natural URLs with transaction UUIDs added, we need to ensure that
		 * the responses are never cached by proxies. In practice, this will not
		 * be needed if the user is logged-in anyway. But if anonymous access is
		 * allowed then the auth cookies would not be sent and WordPress would
		 * not send no-cache headers by default.
		 */
		if ( ! headers_sent() ) {
			nocache_headers();
			header( 'X-Robots: noindex, nofollow, noarchive' );
		}
		add_action( 'wp_head', 'wp_no_robots' );
		add_filter( 'wp_headers', array( $this, 'filter_iframe_security_headers' ) );

		/*
		 * If preview is being served inside the customizer preview iframe, and
		 * if the user doesn't have customize capability, then it is assumed
		 * that the user's session has expired and they need to re-authenticate.
		 */
		if ( $this->messenger_channel && ! current_user_can( 'customize' ) ) {
			$this->wp_die( -1, __( 'Unauthorized. You may remove the customize_messenger_channel param to preview as frontend.' ) );
			return;
		}

		$this->prepare_controls();

		add_filter( 'wp_redirect', array( $this, 'add_state_query_params' ) );

		wp_enqueue_script( 'customize-preview' );
		wp_enqueue_style( 'customize-preview' );
		add_action( 'wp_head', array( $this, 'customize_preview_loading_style' ) );
		add_action( 'wp_head', array( $this, 'remove_frameless_preview_messenger_channel' ) );
		add_action( 'wp_footer', array( $this, 'customize_preview_settings' ), 20 );
		add_filter( 'get_edit_post_link', '__return_empty_string' );

		/**
		 * Fires once the Customizer preview has initialized and JavaScript
		 * settings have been printed.
		 *
		 * @since 3.4.0
		 *
		 * @param WP_Customize_Manager $this WP_Customize_Manager instance.
		 */
		do_action( 'customize_preview_init', $this );
	}

	/**
	 * Filter the X-Frame-Options and Content-Security-Policy headers to ensure frontend can load in customizer.
	 *
	 * @since 4.7.0
	 * @access public
	 *
	 * @param array $headers Headers.
	 * @return array Headers.
	 */
	public function filter_iframe_security_headers( $headers ) {
		$customize_url = admin_url( 'customize.php' );
		$headers['X-Frame-Options'] = 'ALLOW-FROM ' . $customize_url;
		$headers['Content-Security-Policy'] = 'frame-ancestors ' . preg_replace( '#^(\w+://[^/]+).+?$#', '$1', $customize_url );
		return $headers;
	}

	/**
	 * Add customize state query params to a given URL if preview is allowed.
	 *
	 * @since 4.7.0
	 * @access public
	 * @see wp_redirect()
	 * @see WP_Customize_Manager::get_allowed_url()
	 *
	 * @param string $url URL.
	 * @return string URL.
	 */
	public function add_state_query_params( $url ) {
		$parsed_original_url = wp_parse_url( $url );
		$is_allowed = false;
		foreach ( $this->get_allowed_urls() as $allowed_url ) {
			$parsed_allowed_url = wp_parse_url( $allowed_url );
			$is_allowed = (
				$parsed_allowed_url['scheme'] === $parsed_original_url['scheme']
				&&
				$parsed_allowed_url['host'] === $parsed_original_url['host']
				&&
				0 === strpos( $parsed_original_url['path'], $parsed_allowed_url['path'] )
			);
			if ( $is_allowed ) {
				break;
			}
		}

		if ( $is_allowed ) {
			$query_params = array(
				'customize_changeset_uuid' => $this->changeset_uuid(),
			);
			if ( ! $this->is_theme_active() ) {
				$query_params['customize_theme'] = $this->get_stylesheet();
			}
			if ( $this->messenger_channel ) {
				$query_params['customize_messenger_channel'] = $this->messenger_channel;
			}
			$url = add_query_arg( $query_params, $url );
		}

		return $url;
	}

	/**
	 * Prevent sending a 404 status when returning the response for the customize
	 * preview, since it causes the jQuery Ajax to fail. Send 200 instead.
	 *
	 * @since 4.0.0
	 * @deprecated 4.7.0
	 * @access public
	 */
	public function customize_preview_override_404_status() {
		_deprecated_function( __METHOD__, '4.7.0' );
	}

	/**
	 * Print base element for preview frame.
	 *
	 * @since 3.4.0
	 * @deprecated 4.7.0
	 */
	public function customize_preview_base() {
		_deprecated_function( __METHOD__, '4.7.0' );
	}

	/**
	 * Print a workaround to handle HTML5 tags in IE < 9.
	 *
	 * @since 3.4.0
	 * @deprecated 4.7.0 Customizer no longer supports IE8, so all supported browsers recognize HTML5.
	 */
	public function customize_preview_html5() {
		_deprecated_function( __FUNCTION__, '4.7.0' );
	}

	/**
	 * Print CSS for loading indicators for the Customizer preview.
	 *
	 * @since 4.2.0
	 * @access public
	 */
	public function customize_preview_loading_style() {
		?><style>
			body.wp-customizer-unloading {
				opacity: 0.25;
				cursor: progress !important;
				-webkit-transition: opacity 0.5s;
				transition: opacity 0.5s;
			}
			body.wp-customizer-unloading * {
				pointer-events: none !important;
			}
			form.customize-unpreviewable,
			form.customize-unpreviewable input,
			form.customize-unpreviewable select,
			form.customize-unpreviewable button,
			a.customize-unpreviewable,
			area.customize-unpreviewable {
				cursor: not-allowed !important;
			}
		</style><?php
	}

	/**
	 * Remove customize_messenger_channel query parameter from the preview window when it is not in an iframe.
	 *
	 * This ensures that the admin bar will be shown. It also ensures that link navigation will
	 * work as expected since the parent frame is not being sent the URL to navigate to.
	 *
	 * @since 4.7.0
	 * @access public
	 */
	public function remove_frameless_preview_messenger_channel() {
		if ( ! $this->messenger_channel ) {
			return;
		}
		?>
		<script>
		( function() {
			var urlParser, oldQueryParams, newQueryParams, i;
			if ( parent !== window ) {
				return;
			}
			urlParser = document.createElement( 'a' );
			urlParser.href = location.href;
			oldQueryParams = urlParser.search.substr( 1 ).split( /&/ );
			newQueryParams = [];
			for ( i = 0; i < oldQueryParams.length; i += 1 ) {
				if ( ! /^customize_messenger_channel=/.test( oldQueryParams[ i ] ) ) {
					newQueryParams.push( oldQueryParams[ i ] );
				}
			}
			urlParser.search = newQueryParams.join( '&' );
			if ( urlParser.search !== location.search ) {
				location.replace( urlParser.href );
			}
		} )();
		</script>
		<?php
	}

	/**
	 * Print JavaScript settings for preview frame.
	 *
	 * @since 3.4.0
	 */
	public function customize_preview_settings() {
		$post_values = $this->unsanitized_post_values( array( 'exclude_changeset' => true ) );
		$setting_validities = $this->validate_setting_values( $post_values );
		$exported_setting_validities = array_map( array( $this, 'prepare_setting_validity_for_js' ), $setting_validities );

		// Note that the REQUEST_URI is not passed into home_url() since this breaks subdirectory installs.
		$self_url = empty( $_SERVER['REQUEST_URI'] ) ? home_url( '/' ) : esc_url_raw( wp_unslash( $_SERVER['REQUEST_URI'] ) );
		$state_query_params = array(
			'customize_theme',
			'customize_changeset_uuid',
			'customize_messenger_channel',
		);
		$self_url = remove_query_arg( $state_query_params, $self_url );

		$allowed_urls = $this->get_allowed_urls();
		$allowed_hosts = array();
		foreach ( $allowed_urls as $allowed_url ) {
			$parsed = wp_parse_url( $allowed_url );
			if ( empty( $parsed['host'] ) ) {
				continue;
			}
			$host = $parsed['host'];
			if ( ! empty( $parsed['port'] ) ) {
				$host .= ':' . $parsed['port'];
			}
			$allowed_hosts[] = $host;
		}

		$switched_locale = switch_to_locale( get_user_locale() );
		$l10n = array(
			'shiftClickToEdit' => __( 'Shift-click to edit this element.' ),
			'linkUnpreviewable' => __( 'This link is not live-previewable.' ),
			'formUnpreviewable' => __( 'This form is not live-previewable.' ),
		);
		if ( $switched_locale ) {
			restore_previous_locale();
		}

		$settings = array(
			'changeset' => array(
				'uuid' => $this->_changeset_uuid,
			),
			'timeouts' => array(
				'selectiveRefresh' => 250,
				'keepAliveSend' => 1000,
			),
			'theme' => array(
				'stylesheet' => $this->get_stylesheet(),
				'active'     => $this->is_theme_active(),
			),
			'url' => array(
				'self' => $self_url,
				'allowed' => array_map( 'esc_url_raw', $this->get_allowed_urls() ),
				'allowedHosts' => array_unique( $allowed_hosts ),
				'isCrossDomain' => $this->is_cross_domain(),
			),
			'channel' => $this->messenger_channel,
			'activePanels' => array(),
			'activeSections' => array(),
			'activeControls' => array(),
			'settingValidities' => $exported_setting_validities,
			'nonce' => current_user_can( 'customize' ) ? $this->get_nonces() : array(),
			'l10n' => $l10n,
			'_dirty' => array_keys( $post_values ),
		);

		foreach ( $this->panels as $panel_id => $panel ) {
			if ( $panel->check_capabilities() ) {
				$settings['activePanels'][ $panel_id ] = $panel->active();
				foreach ( $panel->sections as $section_id => $section ) {
					if ( $section->check_capabilities() ) {
$settings['activeSections'][ $section_id ] = $section->active();
					}
				}
			}
		}
		foreach ( $this->sections as $id => $section ) {
			if ( $section->check_capabilities() ) {
				$settings['activeSections'][ $id ] = $section->active();
			}
		}
		foreach ( $this->controls as $id => $control ) {
			if ( $control->check_capabilities() ) {
				$settings['activeControls'][ $id ] = $control->active();
			}
		}

		?>
		<script type="text/javascript">
			var _wpCustomizeSettings = <?php echo wp_json_encode( $settings ); ?>;
			_wpCustomizeSettings.values = {};
			(function( v ) {
				<?php
				/*
				 * Serialize settings separately from the initial _wpCustomizeSettings
				 * serialization in order to avoid a peak memory usage spike.
				 * @todo We may not even need to export the values at all since the pane syncs them anyway.
				 */
				foreach ( $this->settings as $id => $setting ) {
					if ( $setting->check_capabilities() ) {
printf(
"v[%s] = %s;\n",
wp_json_encode( $id ),
wp_json_encode( $setting->js_value() )
);
					}
				}
				?>
			})( _wpCustomizeSettings.values );
		</script>
		<?php
	}

	/**
	 * Prints a signature so we can ensure the Customizer was properly executed.
	 *
	 * @since 3.4.0
	 * @deprecated 4.7.0
	 */
	public function customize_preview_signature() {
		_deprecated_function( __METHOD__, '4.7.0' );
	}

	/**
	 * Removes the signature in case we experience a case where the Customizer was not properly executed.
	 *
	 * @since 3.4.0
	 * @deprecated 4.7.0
	 *
	 * @param mixed $return Value passed through for {@see 'wp_die_handler'} filter.
	 * @return mixed Value passed through for {@see 'wp_die_handler'} filter.
	 */
	public function remove_preview_signature( $return = null ) {
		_deprecated_function( __METHOD__, '4.7.0' );

		return $return;
	}

	/**
	 * Is it a theme preview?
	 *
	 * @since 3.4.0
	 *
	 * @return bool True if it's a preview, false if not.
	 */
	public function is_preview() {
		return (bool) $this->previewing;
	}

	/**
	 * Retrieve the template name of the previewed theme.
	 *
	 * @since 3.4.0
	 *
	 * @return string Template name.
	 */
	public function get_template() {
		return $this->theme()->get_template();
	}

	/**
	 * Retrieve the stylesheet name of the previewed theme.
	 *
	 * @since 3.4.0
	 *
	 * @return string Stylesheet name.
	 */
	public function get_stylesheet() {
		return $this->theme()->get_stylesheet();
	}

	/**
	 * Retrieve the template root of the previewed theme.
	 *
	 * @since 3.4.0
	 *
	 * @return string Theme root.
	 */
	public function get_template_root() {
		return get_raw_theme_root( $this->get_template(), true );
	}

	/**
	 * Retrieve the stylesheet root of the previewed theme.
	 *
	 * @since 3.4.0
	 *
	 * @return string Theme root.
	 */
	public function get_stylesheet_root() {
		return get_raw_theme_root( $this->get_stylesheet(), true );
	}

	/**
	 * Filters the current theme and return the name of the previewed theme.
	 *
	 * @since 3.4.0
	 *
	 * @param $current_theme {@internal Parameter is not used}
	 * @return string Theme name.
	 */
	public function current_theme( $current_theme ) {
		return $this->theme()->display('Name');
	}

	/**
	 * Validates setting values.
	 *
	 * Validation is skipped for unregistered settings or for values that are
	 * already null since they will be skipped anyway. Sanitization is applied
	 * to values that pass validation, and values that become null or `WP_Error`
	 * after sanitizing are marked invalid.
	 *
	 * @since 4.6.0
	 * @access public
	 *
	 * @see WP_REST_Request::has_valid_params()
	 * @see WP_Customize_Setting::validate()
	 *
	 * @param array $setting_values Mapping of setting IDs to values to validate and sanitize.
	 * @param array $options {
	 *     Options.
	 *
	 *     @type bool $validate_existence  Whether a setting's existence will be checked.
	 *     @type bool $validate_capability Whether the setting capability will be checked.
	 * }
	 * @return array Mapping of setting IDs to return value of validate method calls, either `true` or `WP_Error`.
	 */
	public function validate_setting_values( $setting_values, $options = array() ) {
		$options = wp_parse_args( $options, array(
			'validate_capability' => false,
			'validate_existence' => false,
		) );

		$validities = array();
		foreach ( $setting_values as $setting_id => $unsanitized_value ) {
			$setting = $this->get_setting( $setting_id );
			if ( ! $setting ) {
				if ( $options['validate_existence'] ) {
					$validities[ $setting_id ] = new WP_Error( 'unrecognized', __( 'Setting does not exist or is unrecognized.' ) );
				}
				continue;
			}
			if ( $options['validate_capability'] && ! current_user_can( $setting->capability ) ) {
				$validity = new WP_Error( 'unauthorized', __( 'Unauthorized to modify setting due to capability.' ) );
			} else {
				if ( is_null( $unsanitized_value ) ) {
					continue;
				}
				$validity = $setting->validate( $unsanitized_value );
			}
			if ( ! is_wp_error( $validity ) ) {
				/** This filter is documented in wp-includes/class-wp-customize-setting.php */
				$late_validity = apply_filters( "customize_validate_{$setting->id}", new WP_Error(), $unsanitized_value, $setting );
				if ( ! empty( $late_validity->errors ) ) {
					$validity = $late_validity;
				}
			}
			if ( ! is_wp_error( $validity ) ) {
				$value = $setting->sanitize( $unsanitized_value );
				if ( is_null( $value ) ) {
					$validity = false;
				} elseif ( is_wp_error( $value ) ) {
					$validity = $value;
				}
			}
			if ( false === $validity ) {
				$validity = new WP_Error( 'invalid_value', __( 'Invalid value.' ) );
			}
			$validities[ $setting_id ] = $validity;
		}
		return $validities;
	}

	/**
	 * Prepares setting validity for exporting to the client (JS).
	 *
	 * Converts `WP_Error` instance into array suitable for passing into the
	 * `wp.customize.Notification` JS model.
	 *
	 * @since 4.6.0
	 * @access public
	 *
	 * @param true|WP_Error $validity Setting validity.
	 * @return true|array If `$validity` was a WP_Error, the error codes will be array-mapped
	 *                    to their respective `message` and `data` to pass into the
	 *                    `wp.customize.Notification` JS model.
	 */
	public function prepare_setting_validity_for_js( $validity ) {
		if ( is_wp_error( $validity ) ) {
			$notification = array();
			foreach ( $validity->errors as $error_code => $error_messages ) {
				$notification[ $error_code ] = array(
					'message' => join( ' ', $error_messages ),
					'data' => $validity->get_error_data( $error_code ),
				);
			}
			return $notification;
		} else {
			return true;
		}
	}

	/**
	 * Handle customize_save WP Ajax request to save/update a changeset.
	 *
	 * @since 3.4.0
	 * @since 4.7.0 The semantics of this method have changed to update a changeset, optionally to also change the status and other attributes.
	 */
	public function save() {
		if ( ! is_user_logged_in() ) {
			wp_send_json_error( 'unauthenticated' );
		}

		if ( ! $this->is_preview() ) {
			wp_send_json_error( 'not_preview' );
		}

		$action = 'save-customize_' . $this->get_stylesheet();
		if ( ! check_ajax_referer( $action, 'nonce', false ) ) {
			wp_send_json_error( 'invalid_nonce' );
		}

		$changeset_post_id = $this->changeset_post_id();
		if ( empty( $changeset_post_id ) ) {
			if ( ! current_user_can( get_post_type_object( 'customize_changeset' )->cap->create_posts ) ) {
				wp_send_json_error( 'cannot_create_changeset_post' );
			}
		} else {
			if ( ! current_user_can( get_post_type_object( 'customize_changeset' )->cap->edit_post, $changeset_post_id ) ) {
				wp_send_json_error( 'cannot_edit_changeset_post' );
			}
		}

		if ( ! empty( $_POST['customize_changeset_data'] ) ) {
			$input_changeset_data = json_decode( wp_unslash( $_POST['customize_changeset_data'] ), true );
			if ( ! is_array( $input_changeset_data ) ) {
				wp_send_json_error( 'invalid_customize_changeset_data' );
			}
		} else {
			$input_changeset_data = array();
		}

		// Validate title.
		$changeset_title = null;
		if ( isset( $_POST['customize_changeset_title'] ) ) {
			$changeset_title = sanitize_text_field( wp_unslash( $_POST['customize_changeset_title'] ) );
		}

		// Validate changeset status param.
		$is_publish = null;
		$changeset_status = null;
		if ( isset( $_POST['customize_changeset_status'] ) ) {
			$changeset_status = wp_unslash( $_POST['customize_changeset_status'] );
			if ( ! get_post_status_object( $changeset_status ) || ! in_array( $changeset_status, array( 'draft', 'pending', 'publish', 'future' ), true ) ) {
				wp_send_json_error( 'bad_customize_changeset_status', 400 );
			}
			$is_publish = ( 'publish' === $changeset_status || 'future' === $changeset_status );
			if ( $is_publish && ! current_user_can( get_post_type_object( 'customize_changeset' )->cap->publish_posts ) ) {
				wp_send_json_error( 'changeset_publish_unauthorized', 403 );
			}
		}

		/*
		 * Validate changeset date param. Date is assumed to be in local time for
		 * the WP if in MySQL format (YYYY-MM-DD HH:MM:SS). Otherwise, the date
		 * is parsed with strtotime() so that ISO date format may be supplied
		 * or a string like "+10 minutes".
		 */
		$changeset_date_gmt = null;
		if ( isset( $_POST['customize_changeset_date'] ) ) {
			$changeset_date = wp_unslash( $_POST['customize_changeset_date'] );
			if ( preg_match( '/^\d\d\d\d-\d\d-\d\d \d\d:\d\d:\d\d$/', $changeset_date ) ) {
				$mm = substr( $changeset_date, 5, 2 );
				$jj = substr( $changeset_date, 8, 2 );
				$aa = substr( $changeset_date, 0, 4 );
				$valid_date = wp_checkdate( $mm, $jj, $aa, $changeset_date );
				if ( ! $valid_date ) {
					wp_send_json_error( 'bad_customize_changeset_date', 400 );
				}
				$changeset_date_gmt = get_gmt_from_date( $changeset_date );
			} else {
				$timestamp = strtotime( $changeset_date );
				if ( ! $timestamp ) {
					wp_send_json_error( 'bad_customize_changeset_date', 400 );
				}
				$changeset_date_gmt = gmdate( 'Y-m-d H:i:s', $timestamp );
			}
		}

		$r = $this->save_changeset_post( array(
			'status' => $changeset_status,
			'title' => $changeset_title,
			'date_gmt' => $changeset_date_gmt,
			'data' => $input_changeset_data,
		) );
		if ( is_wp_error( $r ) ) {
			$response = array(
				'message' => $r->get_error_message(),
				'code' => $r->get_error_code(),
			);
			if ( is_array( $r->get_error_data() ) ) {
				$response = array_merge( $response, $r->get_error_data() );
			} else {
				$response['data'] = $r->get_error_data();
			}
		} else {
			$response = $r;

			// Note that if the changeset status was publish, then it will get set to trash if revisions are not supported.
			$response['changeset_status'] = get_post_status( $this->changeset_post_id() );
			if ( $is_publish && 'trash' === $response['changeset_status'] ) {
				$response['changeset_status'] = 'publish';
			}

			if ( 'publish' === $response['changeset_status'] ) {
				$response['next_changeset_uuid'] = wp_generate_uuid4();
			}
		}

		if ( isset( $response['setting_validities'] ) ) {
			$response['setting_validities'] = array_map( array( $this, 'prepare_setting_validity_for_js' ), $response['setting_validities'] );
		}

		/**
		 * Filters response data for a successful customize_save Ajax request.
		 *
		 * This filter does not apply if there was a nonce or authentication failure.
		 *
		 * @since 4.2.0
		 *
		 * @param array                $response Additional information passed back to the 'saved'
		 *                                       event on `wp.customize`.
		 * @param WP_Customize_Manager $this     WP_Customize_Manager instance.
		 */
		$response = apply_filters( 'customize_save_response', $response, $this );

		if ( is_wp_error( $r ) ) {
			wp_send_json_error( $response );
		} else {
			wp_send_json_success( $response );
		}
	}

	/**
	 * Save the post for the loaded changeset.
	 *
	 * @since 4.7.0
	 * @access public
	 *
	 * @param array $args {
	 *     Args for changeset post.
	 *
	 *     @type array  $data            Optional additional changeset data. Values will be merged on top of any existing post values.
	 *     @type string $status          Post status. Optional. If supplied, the save will be transactional and a post revision will be allowed.
	 *     @type string $title           Post title. Optional.
	 *     @type string $date_gmt        Date in GMT. Optional.
	 *     @type int    $user_id         ID for user who is saving the changeset. Optional, defaults to the current user ID.
	 *     @type bool   $starter_content Whether the data is starter content. If false (default), then $starter_content will be cleared for any $data being saved.
	 * }
	 *
	 * @return array|WP_Error Returns array on success and WP_Error with array data on error.
	 */
	function save_changeset_post( $args = array() ) {

		$args = array_merge(
			array(
				'status' => null,
				'title' => null,
				'data' => array(),
				'date_gmt' => null,
				'user_id' => get_current_user_id(),
				'starter_content' => false,
			),
			$args
		);

		$changeset_post_id = $this->changeset_post_id();
		$existing_changeset_data = array();
		if ( $changeset_post_id ) {
			$existing_status = get_post_status( $changeset_post_id );
			if ( 'publish' === $existing_status || 'trash' === $existing_status ) {
				return new WP_Error( 'changeset_already_published' );
			}

			$existing_changeset_data = $this->get_changeset_post_data( $changeset_post_id );
		}

		// Fail if attempting to publish but publish hook is missing.
		if ( 'publish' === $args['status'] && false === has_action( 'transition_post_status', '_wp_customize_publish_changeset' ) ) {
			return new WP_Error( 'missing_publish_callback' );
		}

		// Validate date.
		$now = gmdate( 'Y-m-d H:i:59' );
		if ( $args['date_gmt'] ) {
			$is_future_dated = ( mysql2date( 'U', $args['date_gmt'], false ) > mysql2date( 'U', $now, false ) );
			if ( ! $is_future_dated ) {
				return new WP_Error( 'not_future_date' ); // Only future dates are allowed.
			}

			if ( ! $this->is_theme_active() && ( 'future' === $args['status'] || $is_future_dated ) ) {
				return new WP_Error( 'cannot_schedule_theme_switches' ); // This should be allowed in the future, when theme is a regular setting.
			}
			$will_remain_auto_draft = ( ! $args['status'] && ( ! $changeset_post_id || 'auto-draft' === get_post_status( $changeset_post_id ) ) );
			if ( $will_remain_auto_draft ) {
				return new WP_Error( 'cannot_supply_date_for_auto_draft_changeset' );
			}
		} elseif ( $changeset_post_id && 'future' === $args['status'] ) {

			// Fail if the new status is future but the existing post's date is not in the future.
			$changeset_post = get_post( $changeset_post_id );
			if ( mysql2date( 'U', $changeset_post->post_date_gmt, false ) <= mysql2date( 'U', $now, false ) ) {
				return new WP_Error( 'not_future_date' );
			}
		}

		// The request was made via wp.customize.previewer.save().
		$update_transactionally = (bool) $args['status'];
		$allow_revision = (bool) $args['status'];

		// Amend post values with any supplied data.
		foreach ( $args['data'] as $setting_id => $setting_params ) {
			if ( array_key_exists( 'value', $setting_params ) ) {
				$this->set_post_value( $setting_id, $setting_params['value'] ); // Add to post values so that they can be validated and sanitized.
			}
		}

		// Note that in addition to post data, this will include any stashed theme mods.
		$post_values = $this->unsanitized_post_values( array(
			'exclude_changeset' => true,
			'exclude_post_data' => false,
		) );
		$this->add_dynamic_settings( array_keys( $post_values ) ); // Ensure settings get created even if they lack an input value.

		/*
		 * Get list of IDs for settings that have values different from what is currently
		 * saved in the changeset. By skipping any values that are already the same, the
		 * subset of changed settings can be passed into validate_setting_values to prevent
		 * an underprivileged modifying a single setting for which they have the capability
		 * from being blocked from saving. This also prevents a user from touching of the
		 * previous saved settings and overriding the associated user_id if they made no change.
		 */
		$changed_setting_ids = array();
		foreach ( $post_values as $setting_id => $setting_value ) {
			$setting = $this->get_setting( $setting_id );

			if ( $setting && 'theme_mod' === $setting->type ) {
				$prefixed_setting_id = $this->get_stylesheet() . '::' . $setting->id;
			} else {
				$prefixed_setting_id = $setting_id;
			}

			$is_value_changed = (
				! isset( $existing_changeset_data[ $prefixed_setting_id ] )
				||
				! array_key_exists( 'value', $existing_changeset_data[ $prefixed_setting_id ] )
				||
				$existing_changeset_data[ $prefixed_setting_id ]['value'] !== $setting_value
			);
			if ( $is_value_changed ) {
				$changed_setting_ids[] = $setting_id;
			}
		}

		/**
		 * Fires before save validation happens.
		 *
		 * Plugins can add just-in-time {@see 'customize_validate_{$this->ID}'} filters
		 * at this point to catch any settings registered after `customize_register`.
		 * The dynamic portion of the hook name, `$this->ID` refers to the setting ID.
		 *
		 * @since 4.6.0
		 *
		 * @param WP_Customize_Manager $this WP_Customize_Manager instance.
		 */
		do_action( 'customize_save_validation_before', $this );

		// Validate settings.
		$validated_values = array_merge(
			array_fill_keys( array_keys( $args['data'] ), null ), // Make sure existence/capability checks are done on value-less setting updates.
			$post_values
		);
		$setting_validities = $this->validate_setting_values( $validated_values, array(
			'validate_capability' => true,
			'validate_existence' => true,
		) );
		$invalid_setting_count = count( array_filter( $setting_validities, 'is_wp_error' ) );

		/*
		 * Short-circuit if there are invalid settings the update is transactional.
		 * A changeset update is transactional when a status is supplied in the request.
		 */
		if ( $update_transactionally && $invalid_setting_count > 0 ) {
			$response = array(
				'setting_validities' => $setting_validities,
				'message' => sprintf( _n( 'There is %s invalid setting.', 'There are %s invalid settings.', $invalid_setting_count ), number_format_i18n( $invalid_setting_count ) ),
			);
			return new WP_Error( 'transaction_fail', '', $response );
		}

		// Obtain/merge data for changeset.
		$original_changeset_data = $this->get_changeset_post_data( $changeset_post_id );
		$data = $original_changeset_data;
		if ( is_wp_error( $data ) ) {
			$data = array();
		}

		// Ensure that all post values are included in the changeset data.
		foreach ( $post_values as $setting_id => $post_value ) {
			if ( ! isset( $args['data'][ $setting_id ] ) ) {
				$args['data'][ $setting_id ] = array();
			}
			if ( ! isset( $args['data'][ $setting_id ]['value'] ) ) {
				$args['data'][ $setting_id ]['value'] = $post_value;
			}
		}

		foreach ( $args['data'] as $setting_id => $setting_params ) {
			$setting = $this->get_setting( $setting_id );
			if ( ! $setting || ! $setting->check_capabilities() ) {
				continue;
			}

			// Skip updating changeset for invalid setting values.
			if ( isset( $setting_validities[ $setting_id ] ) && is_wp_error( $setting_validities[ $setting_id ] ) ) {
				continue;
			}

			$changeset_setting_id = $setting_id;
			if ( 'theme_mod' === $setting->type ) {
				$changeset_setting_id = sprintf( '%s::%s', $this->get_stylesheet(), $setting_id );
			}

			if ( null === $setting_params ) {
				// Remove setting from changeset entirely.
				unset( $data[ $changeset_setting_id ] );
			} else {

				if ( ! isset( $data[ $changeset_setting_id ] ) ) {
					$data[ $changeset_setting_id ] = array();
				}

				// Merge any additional setting params that have been supplied with the existing params.
				$merged_setting_params = array_merge( $data[ $changeset_setting_id ], $setting_params );

				// Skip updating setting params if unchanged (ensuring the user_id is not overwritten).
				if ( $data[ $changeset_setting_id ] === $merged_setting_params ) {
					continue;
				}

				$data[ $changeset_setting_id ] = array_merge(
					$merged_setting_params,
					array(
'type' => $setting->type,
'user_id' => $args['user_id'],
					)
				);

				// Clear starter_content flag in data if changeset is not explicitly being updated for starter content.
				if ( empty( $args['starter_content'] ) ) {
					unset( $data[ $changeset_setting_id ]['starter_content'] );
				}
			}
		}

		$filter_context = array(
			'uuid' => $this->changeset_uuid(),
			'title' => $args['title'],
			'status' => $args['status'],
			'date_gmt' => $args['date_gmt'],
			'post_id' => $changeset_post_id,
			'previous_data' => is_wp_error( $original_changeset_data ) ? array() : $original_changeset_data,
			'manager' => $this,
		);

		/**
		 * Filters the settings' data that will be persisted into the changeset.
		 *
		 * Plugins may amend additional data (such as additional meta for settings) into the changeset with this filter.
		 *
		 * @since 4.7.0
		 *
		 * @param array $data Updated changeset data, mapping setting IDs to arrays containing a $value item and optionally other metadata.
		 * @param array $context {
		 *     Filter context.
		 *
		 *     @type string               $uuid          Changeset UUID.
		 *     @type string               $title         Requested title for the changeset post.
		 *     @type string               $status        Requested status for the changeset post.
		 *     @type string               $date_gmt      Requested date for the changeset post in MySQL format and GMT timezone.
		 *     @type int|false            $post_id       Post ID for the changeset, or false if it doesn't exist yet.
		 *     @type array                $previous_data Previous data contained in the changeset.
		 *     @type WP_Customize_Manager $manager       Manager instance.
		 * }
		 */
		$data = apply_filters( 'customize_changeset_save_data', $data, $filter_context );

		// Switch theme if publishing changes now.
		if ( 'publish' === $args['status'] && ! $this->is_theme_active() ) {
			// Temporarily stop previewing the theme to allow switch_themes() to operate properly.
			$this->stop_previewing_theme();
			switch_theme( $this->get_stylesheet() );
			update_option( 'theme_switched_via_customizer', true );
			$this->start_previewing_theme();
		}

		// Gather the data for wp_insert_post()/wp_update_post().
		$json_options = 0;
		if ( defined( 'JSON_UNESCAPED_SLASHES' ) ) {
			$json_options |= JSON_UNESCAPED_SLASHES; // Introduced in PHP 5.4. This is only to improve readability as slashes needn't be escaped in storage.
		}
		$json_options |= JSON_PRETTY_PRINT; // Also introduced in PHP 5.4, but WP defines constant for back compat. See WP Trac

---

更新日志

Version	description
3.4.0	Introduced.

---

Methods

• __construct Constructor.
• _cmp_priority Helper function to compare two objects by priority, ensuring sort stability via instance_number. deprecated
• _filter_revision_post_has_changed Filters whether a changeset has changed to create a new revision.
• _publish_changeset_values Publish changeset values.
• _render_custom_logo_partial Callback for rendering the custom logo, used in the custom_logo partial.
• _sanitize_background_setting Callback for validating a background setting value.
• _sanitize_external_header_video Callback for sanitizing the external_header_video value.
• _sanitize_header_textcolor Callback for validating the header_textcolor value.
• _save_starter_content_changeset Save starter content changeset.
• _validate_external_header_video Callback for validating the external_header_video value.
• _validate_header_video Callback for validating the header_video value.
• add_control Add a customize control.
• add_dynamic_settings Register any dynamically-created settings, such as those from $_POST['customized'] that have no corresponding setting created.
• add_panel Add a customize panel.
• add_section Add a customize section.
• add_setting Add a customize setting.
• add_state_query_params Add customize state query params to a given URL if preview is allowed.
• after_setup_theme Callback to validate a theme once it is loaded
• changeset_data Get changeset data.
• changeset_post_id Get the changeset post id for the loaded changeset.
• changeset_uuid Get the changeset UUID.
• containers Get the registered containers.
• controls Get the registered controls.
• current_theme Filters the current theme and return the name of the previewed theme.
• customize_pane_settings Print JavaScript settings for parent window.
• customize_preview_base Print base element for preview frame. deprecated
• customize_preview_html5 Print a workaround to handle HTML5 tags in IE < 9. deprecated
• customize_preview_init Print JavaScript settings.
• customize_preview_loading_style Print CSS for loading indicators for the Customizer preview.
• customize_preview_override_404_status Prevent sending a 404 status when returning the response for the customize preview, since it causes the jQuery Ajax to fail. Send 200 instead. deprecated
• customize_preview_settings Print JavaScript settings for preview frame.
• customize_preview_signature Prints a signature so we can ensure the Customizer was properly executed. deprecated
• doing_ajax Return true if it's an Ajax request.
• enqueue_control_scripts Enqueue scripts for customize controls.
• export_header_video_settings Export header video settings to facilitate selective refresh.
• filter_iframe_security_headers Filter the X-Frame-Options and Content-Security-Policy headers to ensure frontend can load in customizer.
• find_changeset_post_id Find the changeset post ID for a given changeset UUID.
• get_allowed_urls Get URLs allowed to be previewed.
• get_autofocus Get the autofocused constructs.
• get_changeset_post_data Get the data stored in a changeset post.
• get_control Retrieve a customize control.
• get_document_title_template Get the template string for the Customizer pane document title.
• get_messenger_channel Get messenger channel.
• get_nonces Get nonces for the Customizer.
• get_panel Retrieve a customize panel.
• get_preview_url Get the initial URL to be previewed.
• get_previewable_devices Returns a list of devices to allow previewing.
• get_return_url Get URL to link the user to when closing the Customizer.
• get_section Retrieve a customize section.
• get_setting Retrieve a customize setting.
• get_stylesheet Retrieve the stylesheet name of the previewed theme.
• get_stylesheet_root Retrieve the stylesheet root of the previewed theme.
• get_template Retrieve the template name of the previewed theme.
• get_template_root Retrieve the template root of the previewed theme.
• has_published_pages Return whether there are published pages.
• import_theme_starter_content Import theme starter content into the customized state.
• is_cross_domain Determines whether the admin and the frontend are on different domains.
• is_ios Determine whether the user agent is iOS.
• is_preview Is it a theme preview?
• is_theme_active Checks if the current theme is active.
• panels Get the registered panels.
• post_value Returns the sanitized value for a given setting from the current customized state.
• prepare_controls Prepare panels, sections, and controls.
• prepare_setting_validity_for_js Prepares setting validity for exporting to the client (JS).
• prepare_starter_content_attachments Prepare starter content attachments.
• refresh_nonces Refresh nonces for the current preview.
• register_control_type Register a customize control type.
• register_controls Register some default controls.
• register_dynamic_settings Add settings from the POST data that were not added with code, e.g. dynamically-created settings for Widgets
• register_panel_type Register a customize panel type.
• register_section_type Register a customize section type.
• remove_control Remove a customize control.
• remove_frameless_preview_messenger_channel Remove customize_messenger_channel query parameter from the preview window when it is not in an iframe.
• remove_panel Remove a customize panel.
• remove_preview_signature Removes the signature in case we experience a case where the Customizer was not properly executed. deprecated
• remove_section Remove a customize section.
• remove_setting Remove a customize setting.
• render_control_templates Render JS templates for all registered control types.
• render_panel_templates Render JS templates for all registered panel types.
• render_section_templates Render JS templates for all registered section types.
• save Handle customize_save WP Ajax request to save/update a changeset.
• save_changeset_post Save the post for the loaded changeset.
• sections Get the registered sections.
• set_autofocus Set the autofocused constructs.
• set_post_value Override a setting's value in the current customized state.
• set_preview_url Set the initial URL to be previewed.
• set_return_url Set URL to link the user to when closing the Customizer.
• settings Get the registered settings.
• setup_theme Start preview and customize theme.
• start_previewing_theme If the theme to be previewed isn't the active theme, add filter callbacks to swap it out at runtime.
• stop_previewing_theme Stop previewing the selected theme.
• theme Get the theme being customized.
• unsanitized_post_values Get dirty pre-sanitized setting values in the current customized state.
• update_stashed_theme_mod_settings Update stashed theme mod settings.
• validate_setting_values Validates setting values.
• wp_die Custom wp_die wrapper. Returns either the standard message for UI or the Ajax message.
• wp_die_handler Return the Ajax wp_die() handler if it's a customized request. deprecated
• wp_loaded Register styles/scripts and initialize the preview of each setting
• wp_redirect_status Prevents Ajax requests from following redirects when previewing a theme by issuing a 200 response instead of a 30x. deprecated

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User Contributed Notes