get_post_galleries_images( int|WP_Post $post ): array

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   Codex 10 years ago

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   A simple example of how to append the raw image URLs to the content of any post or page that has at least one gallery.

   /**
    * Add list of image URLs to the content if displaying a post with one or more image galleries.
    *
    * @param string $content Post content.
    * @return string (Maybe modified) post content.
    */
   function wpdocs_show_gallery_image_urls( $content ) {
   
   	global $post;
   
   	// Only do this on singular items.
   	if ( ! is_singular() ) {
   		return $content;
   	}
   
   	// Make sure the post has a gallery in it.
   	if ( ! has_shortcode( $post->post_content, 'gallery' ) ) {
   		return $content;
   	}
   
   	// Retrieve all galleries of this post.
   	$galleries = get_post_galleries_images( $post );
   
   	if ( ! empty( $galleries ) ) {
   		$image_list = '<ul>';
   
   		// Loop through all galleries found
   		foreach( $galleries as $gallery ) {
   			// Loop through each image in each gallery.
   			foreach ( $gallery as $image ) {
   				$image_list .= '<li>' . $image . '</li>';
   			}
   		}
   
   		$image_list .= '</ul>';
   
   		// Append our image list to the content of our post
   		$content .= $image_list;
   	}
   	return $content;
    }
   add_filter( 'the_content', 'wpdocs_show_gallery_image_urls' );