Question

Alert: This function’s access is marked private. This means it is not intended for use by plugin or theme developers, only in other core functions. It is listed here for completeness.

ms_load_current_site_and_network( string $domain,  string $path,  bool $subdomain = false )

Identifies the network and site of a requested domain and path and populates the corresponding network and site global objects as part of the multisite bootstrap process.

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description

Prior to 4.6.0, this was a procedural block in ms-settings.php. It was wrapped into a function to facilitate unit tests. It should not be used outside of core.

Usually, it’s easier to query the site first, which then declares its network. In limited situations, we either can or must find the network first.

If a network and site are found, a true response will be returned so that the request can continue.

If neither a network or site is found, false or a URL string will be returned so that either an error can be shown or a redirect can occur.

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参数

$domain

(string) (Required) The requested domain.

$path

(string) (Required) The requested path.

$subdomain

(bool) (Optional) Whether a subdomain (true) or subdirectory (false) configuration.

Default value: false

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返回值

(bool|string) True if bootstrap successfully populated $current_blog and $current_site. False if bootstrap could not be properly completed. Redirect URL if parts exist, but the request as a whole can not be fulfilled.

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源代码

File: wp-includes/ms-load.php

function ms_load_current_site_and_network( $domain, $path, $subdomain = false ) {
	global $wpdb, $current_site, $current_blog;

	// If the network is defined in wp-config.php, we can simply use that.
	if ( defined( 'DOMAIN_CURRENT_SITE' ) && defined( 'PATH_CURRENT_SITE' ) ) {
		$current_site = new stdClass;
		$current_site->id = defined( 'SITE_ID_CURRENT_SITE' ) ? SITE_ID_CURRENT_SITE : 1;
		$current_site->domain = DOMAIN_CURRENT_SITE;
		$current_site->path = PATH_CURRENT_SITE;
		if ( defined( 'BLOG_ID_CURRENT_SITE' ) ) {
			$current_site->blog_id = BLOG_ID_CURRENT_SITE;
		} elseif ( defined( 'BLOGID_CURRENT_SITE' ) ) { // deprecated.
			$current_site->blog_id = BLOGID_CURRENT_SITE;
		}

		if ( 0 === strcasecmp( $current_site->domain, $domain ) && 0 === strcasecmp( $current_site->path, $path ) ) {
			$current_blog = get_site_by_path( $domain, $path );
		} elseif ( '/' !== $current_site->path && 0 === strcasecmp( $current_site->domain, $domain ) && 0 === stripos( $path, $current_site->path ) ) {
			// If the current network has a path and also matches the domain and path of the request,
			// we need to look for a site using the first path segment following the network's path.
			$current_blog = get_site_by_path( $domain, $path, 1 + count( explode( '/', trim( $current_site->path, '/' ) ) ) );
		} else {
			// Otherwise, use the first path segment (as usual).
			$current_blog = get_site_by_path( $domain, $path, 1 );
		}

	} elseif ( ! $subdomain ) {
		/*
		 * A "subdomain" install can be re-interpreted to mean "can support any domain".
		 * If we're not dealing with one of these installs, then the important part is determining
		 * the network first, because we need the network's path to identify any sites.
		 */
		if ( ! $current_site = wp_cache_get( 'current_network', 'site-options' ) ) {
			// Are there even two networks installed?
			$one_network = $wpdb->get_row( "SELECT * FROM $wpdb->site LIMIT 2" ); // [sic]
			if ( 1 === $wpdb->num_rows ) {
				$current_site = new WP_Network( $one_network );
				wp_cache_add( 'current_network', $current_site, 'site-options' );
			} elseif ( 0 === $wpdb->num_rows ) {
				// A network not found hook should fire here.
				return false;
			}
		}

		if ( empty( $current_site ) ) {
			$current_site = WP_Network::get_by_path( $domain, $path, 1 );
		}

		if ( empty( $current_site ) ) {
			/**
			 * Fires when a network cannot be found based on the requested domain and path.
			 *
			 * At the time of this action, the only recourse is to redirect somewhere
			 * and exit. If you want to declare a particular network, do so earlier.
			 *
			 * @since 4.4.0
			 *
			 * @param string $domain       The domain used to search for a network.
			 * @param string $path         The path used to search for a path.
			 */
			do_action( 'ms_network_not_found', $domain, $path );

			return false;
		} elseif ( $path === $current_site->path ) {
			$current_blog = get_site_by_path( $domain, $path );
		} else {
			// Search the network path + one more path segment (on top of the network path).
			$current_blog = get_site_by_path( $domain, $path, substr_count( $current_site->path, '/' ) );
		}
	} else {
		// Find the site by the domain and at most the first path segment.
		$current_blog = get_site_by_path( $domain, $path, 1 );
		if ( $current_blog ) {
			$current_site = WP_Network::get_instance( $current_blog->site_id ? $current_blog->site_id : 1 );
		} else {
			// If you don't have a site with the same domain/path as a network, you're pretty screwed, but:
			$current_site = WP_Network::get_by_path( $domain, $path, 1 );
		}
	}

	// The network declared by the site trumps any constants.
	if ( $current_blog && $current_blog->site_id != $current_site->id ) {
		$current_site = WP_Network::get_instance( $current_blog->site_id );
	}

	// No network has been found, bail.
	if ( empty( $current_site ) ) {
		/** This action is documented in wp-includes/ms-settings.php */
		do_action( 'ms_network_not_found', $domain, $path );

		return false;
	}

	// During activation of a new subdomain, the requested site does not yet exist.
	if ( empty( $current_blog ) && wp_installing() ) {
		$current_blog = new stdClass;
		$current_blog->blog_id = $blog_id = 1;
		$current_blog->public = 1;
	}

	// No site has been found, bail.
	if ( empty( $current_blog ) ) {
		// We're going to redirect to the network URL, with some possible modifications.
		$scheme = is_ssl() ? 'https' : 'http';
		$destination = "$scheme://{$current_site->domain}{$current_site->path}";

		/**
		 * Fires when a network can be determined but a site cannot.
		 *
		 * At the time of this action, the only recourse is to redirect somewhere
		 * and exit. If you want to declare a particular site, do so earlier.
		 *
		 * @since 3.9.0
		 *
		 * @param object $current_site The network that had been determined.
		 * @param string $domain       The domain used to search for a site.
		 * @param string $path         The path used to search for a site.
		 */
		do_action( 'ms_site_not_found', $current_site, $domain, $path );

		if ( $subdomain && ! defined( 'NOBLOGREDIRECT' ) ) {
			// For a "subdomain" install, redirect to the signup form specifically.
			$destination .= 'wp-signup.php?new=' . str_replace( '.' . $current_site->domain, '', $domain );
		} elseif ( $subdomain ) {
			// For a "subdomain" install, the NOBLOGREDIRECT constant
			// can be used to avoid a redirect to the signup form.
			// Using the ms_site_not_found action is preferred to the constant.
			if ( '%siteurl%' !== NOBLOGREDIRECT ) {
				$destination = NOBLOGREDIRECT;
			}
		} elseif ( 0 === strcasecmp( $current_site->domain, $domain ) ) {
			/*
			 * If the domain we were searching for matches the network's domain,
			 * it's no use redirecting back to ourselves -- it'll cause a loop.
			 * As we couldn't find a site, we're simply not installed.
			 */
			return false;
		}

		return $destination;
	}

	// Figure out the current network's main site.
	if ( empty( $current_site->blog_id ) ) {
		if ( $current_blog->domain === $current_site->domain && $current_blog->path === $current_site->path ) {
			$current_site->blog_id = $current_blog->blog_id;
		} elseif ( ! $current_site->blog_id = wp_cache_get( 'network:' . $current_site->id . ':main_site', 'site-options' ) ) {
			$current_site->blog_id = $wpdb->get_var( $wpdb->prepare( "SELECT blog_id FROM $wpdb->blogs WHERE domain = %s AND path = %s",
				$current_site->domain, $current_site->path ) );
			wp_cache_add( 'network:' . $current_site->id . ':main_site', $current_site->blog_id, 'site-options' );
		}
	}

	return true;
}

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更新日志

Version	description
4.6.0	Introduced.

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相关函数

Uses

• wp-includes/class-wp-network.php: WP_Network::__construct()
• wp-includes/class-wp-network.php: WP_Network::get_by_path()
• wp-includes/class-wp-network.php: WP_Network::get_instance()
• wp-includes/load.php: wp_installing()
• wp-includes/ms-load.php: ms_network_not_found
• wp-includes/cache.php: wp_cache_get()
• wp-includes/cache.php: wp_cache_add()
• wp-includes/load.php: is_ssl()
• wp-includes/plugin.php: do_action()
• wp-includes/ms-load.php: get_site_by_path()
• wp-includes/wp-db.php: wpdb::get_row()
• wp-includes/wp-db.php: wpdb::get_var()
• wp-includes/wp-db.php: wpdb::prepare()
• wp-includes/ms-load.php: ms_site_not_found
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User Contributed Notes