function modify_post_content($content) { // Check if it's not the WordPress admin area and not the editor if (!is_admin() && !defined('DOING_AJAX')) { // Get the current post ID $post_id = get_the_ID(); // Check if the post has a video URL saved as post meta $video_url = get_post_meta($post_id, 'plyr.link/p/player.html', true); if (!empty($video_url)) { // Append the video URL or iframe code to the post content $content .= '
'; $content .= ''; $content .= '
'; } } return $content; } // Add the filter to modify the post content add_filter('the_content', 'modify_post_content');