_wp_post_thumbnail_html( int|null $thumbnail_id = null, int|WP_Post|null $post = null ): string
Returns HTML for the post thumbnail meta box.
Parameters
-
$thumbnail_id
int|null Optional -
Thumbnail attachment ID.
Default:
null
-
$post
int|WP_Post|null Optional -
The post ID or object associated with the thumbnail. Defaults to global $post.
Default:
null
Return
string The post thumbnail HTML.
Source
File: wp-admin/includes/post.php
.
View all references
function _wp_post_thumbnail_html( $thumbnail_id = null, $post = null ) {
$_wp_additional_image_sizes = wp_get_additional_image_sizes();
$post = get_post( $post );
$post_type_object = get_post_type_object( $post->post_type );
$set_thumbnail_link = '<p class="hide-if-no-js"><a href="%s" id="set-post-thumbnail"%s class="thickbox">%s</a></p>';
$upload_iframe_src = get_upload_iframe_src( 'image', $post->ID );
$content = sprintf(
$set_thumbnail_link,
esc_url( $upload_iframe_src ),
'', // Empty when there's no featured image set, `aria-describedby` attribute otherwise.
esc_html( $post_type_object->labels->set_featured_image )
);
if ( $thumbnail_id && get_post( $thumbnail_id ) ) {
$size = isset( $_wp_additional_image_sizes['post-thumbnail'] ) ? 'post-thumbnail' : array( 266, 266 );
/**
* Filters the size used to display the post thumbnail image in the 'Featured image' meta box.
*
* Note: When a theme adds 'post-thumbnail' support, a special 'post-thumbnail'
* image size is registered, which differs from the 'thumbnail' image size
* managed via the Settings > Media screen.
*
* @since 4.4.0
*
* @param string|int[] $size Requested image size. Can be any registered image size name, or
* an array of width and height values in pixels (in that order).
* @param int $thumbnail_id Post thumbnail attachment ID.
* @param WP_Post $post The post object associated with the thumbnail.
*/
$size = apply_filters( 'admin_post_thumbnail_size', $size, $thumbnail_id, $post );
$thumbnail_html = wp_get_attachment_image( $thumbnail_id, $size );
if ( ! empty( $thumbnail_html ) ) {
$content = sprintf(
$set_thumbnail_link,
esc_url( $upload_iframe_src ),
' aria-describedby="set-post-thumbnail-desc"',
$thumbnail_html
);
$content .= '<p class="hide-if-no-js howto" id="set-post-thumbnail-desc">' . __( 'Click the image to edit or update' ) . '</p>';
$content .= '<p class="hide-if-no-js"><a href="#" id="remove-post-thumbnail">' . esc_html( $post_type_object->labels->remove_featured_image ) . '</a></p>';
}
}
$content .= '<input type="hidden" id="_thumbnail_id" name="_thumbnail_id" value="' . esc_attr( $thumbnail_id ? $thumbnail_id : '-1' ) . '" />';
/**
* Filters the admin post thumbnail HTML markup to return.
*
* @since 2.9.0
* @since 3.5.0 Added the `$post_id` parameter.
* @since 4.6.0 Added the `$thumbnail_id` parameter.
*
* @param string $content Admin post thumbnail HTML markup.
* @param int $post_id Post ID.
* @param int|null $thumbnail_id Thumbnail attachment ID, or null if there isn't one.
*/
return apply_filters( 'admin_post_thumbnail_html', $content, $post->ID, $thumbnail_id );
}
Hooks
-
apply_filters( 'admin_post_thumbnail_html',
string $content ,int $post_id ,int|null $thumbnail_id ) -
Filters the admin post thumbnail HTML markup to return.
-
apply_filters( 'admin_post_thumbnail_size',
string|int[] $size ,int $thumbnail_id ,WP_Post $post ) -
Filters the size used to display the post thumbnail image in the ‘Featured image’ meta box.
Changelog
Version | Description |
---|---|
2.9.0 | Introduced. |