ID ); $exclude_types = array( '' ); $exclude_types = apply_filters( 'eat_exclude_types', $exclude_types ); // do nothing if the post has already a featured image set if ( $already_has_thumb ) { return; } // do the job if the post is not from an excluded type if ( ! in_array( $post_type, $exclude_types ) ) { // get first attached image $img = rv_auto_featured_image_catch_that_image( $post ); $attachment_id = attachment_url_to_postid( $img ); if ( $attachment_id ) { // add attachment ID add_post_meta( $post->ID, '_thumbnail_id', $attachment_id, true ); } } } // set featured image before post is displayed (for old posts) add_action( 'the_post', 'rv_auto_featured_image_add_thumbnail' ); // hooks added to set the thumbnail when publishing too add_action( 'new_to_publish', 'rv_auto_featured_image_add_thumbnail' ); add_action( 'draft_to_publish', 'rv_auto_featured_image_add_thumbnail' ); add_action( 'pending_to_publish', 'rv_auto_featured_image_add_thumbnail' ); add_action( 'future_to_publish', 'rv_auto_featured_image_add_thumbnail' ); function rv_auto_featured_image_catch_that_image( $post ) { // Find the images in the post_content. $output = preg_match_all( '//i', $post->post_content, $matches ); $first_img = isset( $matches[1][0] ) ? $matches[1][0]:''; // if no images found, do nothing if ( empty ( $first_img ) ) { return false; } return $first_img; } } Preview: Boom Baby offers frank, and funny, look at life in Alberta’s oilpatch – BCI 24 News Network