apply_filters( ‘admin_post_thumbnail_html’, string $content, int $post_id, int|null $thumbnail_id )

User Contributed Notes

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   Jonathan Goldford 7 years ago

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   Below is an example of how to use this filter to provide some additional text to admins on what size image to use for their featured images. If an image is currently in place, this text will show above it. If not, the help text will show just above the “Set featured image” link.

   function filter_featured_image_admin_text( $content, $post_id, $thumbnail_id ){
       $help_text = '<p>' . __( 'Please use an image that is 1170 pixels wide x 658 pixels tall.', 'my_domain' ) . '</p>';
       return $help_text . $content;
   }
   add_filter( 'admin_post_thumbnail_html', 'filter_featured_image_admin_text', 10, 3 );
2. Skip to note 4 content

   Azhar Khan 2 years ago

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   Doesn’t work with new Gutenberg.

   There’s a open discussion going on for this.

   https://github.com/WordPress/gutenberg/issues/12742