Question

get_custom_logo( int $blog_id )

Returns a custom logo, linked to home.

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description

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参数

$blog_id

(int) (Optional) ID of the blog in question. Default is the ID of the current blog.

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返回值

(string) Custom logo markup.

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源代码

File: wp-includes/general-template.php

function get_custom_logo( $blog_id = 0 ) {
	$html = '';
	$switched_blog = false;

	if ( is_multisite() && ! empty( $blog_id ) && (int) $blog_id !== get_current_blog_id() ) {
		switch_to_blog( $blog_id );
		$switched_blog = true;
	}

	$custom_logo_id = get_theme_mod( 'custom_logo' );

	// We have a logo. Logo is go.
	if ( $custom_logo_id ) {
		$custom_logo_attr = array(
			'class'    => 'custom-logo',
			'itemprop' => 'logo',
		);

		/*
		 * If the logo alt attribute is empty, get the site title and explicitly
		 * pass it to the attributes used by wp_get_attachment_image().
		 */
		$image_alt = get_post_meta( $custom_logo_id, '_wp_attachment_image_alt', true );
		if ( empty( $image_alt ) ) {
			$custom_logo_attr['alt'] = get_bloginfo( 'name', 'display' );
		}

		/*
		 * If the alt attribute is not empty, there's no need to explicitly pass
		 * it because wp_get_attachment_image() already adds the alt attribute.
		 */
		$html = sprintf( '<a href="%1$s" class="custom-logo-link" rel="home" itemprop="url">%2$s</a>',
			esc_url( home_url( '/' ) ),
			wp_get_attachment_image( $custom_logo_id, 'full', false, $custom_logo_attr )
		);
	}

	// If no logo is set but we're in the Customizer, leave a placeholder (needed for the live preview).
	elseif ( is_customize_preview() ) {
		$html = sprintf( '<a href="%1$s" class="custom-logo-link" style="display:none;"><img class="custom-logo"/></a>',
			esc_url( home_url( '/' ) )
		);
	}

	if ( $switched_blog ) {
		restore_current_blog();
	}

	/**
	 * Filters the custom logo output.
	 *
	 * @since 4.5.0
	 * @since 4.6.0 Added the `$blog_id` parameter.
	 *
	 * @param string $html    Custom logo HTML output.
	 * @param int    $blog_id ID of the blog to get the custom logo for.
	 */
	return apply_filters( 'get_custom_logo', $html, $blog_id );
}

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更新日志

Version	description
4.5.0	Introduced.

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相关函数

Uses

• wp-includes/general-template.php: get_custom_logo
• wp-includes/theme.php: is_customize_preview()
• wp-includes/theme.php: get_theme_mod()
• wp-includes/formatting.php: esc_url()
• wp-includes/general-template.php: get_bloginfo()
• wp-includes/load.php: is_multisite()
• wp-includes/load.php: get_current_blog_id()
• wp-includes/link-template.php: home_url()
• wp-includes/plugin.php: apply_filters()
• wp-includes/media.php: wp_get_attachment_image()
• wp-includes/post.php: get_post_meta()
• wp-includes/ms-blogs.php: switch_to_blog()
• wp-includes/ms-blogs.php: restore_current_blog()
Show 8 more uses Hide more uses

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Used By

• wp-includes/class-wp-customize-manager.php: WP_Customize_Manager::_render_custom_logo_partial()
• wp-includes/general-template.php: the_custom_logo()

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User Contributed Notes

1. Skip to note content You must log in to vote on the helpfulness of this noteVote results for this note: 1You must log in to vote on the helpfulness of this note Contributed by Anthony Hortin

   See Also
   the_custom_logo()
   has_custom_logo()

To get the URL of the custom logo image:

$custom_logo_id = get_theme_mod( 'custom_logo' );
$image = wp_get_attachment_image_src( $custom_logo_id , 'full' );
echo $image[0];