47、wordpress删除文章的时候自动删除文章图片

使用场景：删除文章的时候不会删除文章中所含的图片附件，导致wordpress网站里面有不少并没有用的图片，占空间。

将下面代码复制粘贴到当前主题下的functions.php里

/* 删除文章时删除图片附件 */
function delete_post_and_attachments($post_ID) {
 global $wpdb;
 //删除特色图片
$thumbnails = $wpdb->get_results( "SELECT * FROM $wpdb->postmeta WHERE meta_key = '_thumbnail_id' AND post_id = $post_ID" );
 foreach ( $thumbnails as $thumbnail ) {
 wp_delete_attachment( $thumbnail->meta_value, true );
 }
 //删除图片附件
$attachments = $wpdb->get_results( "SELECT * FROM $wpdb->posts WHERE post_parent = $post_ID AND post_type = 'attachment'" );
 foreach ( $attachments as $attachment ) {
 wp_delete_attachment( $attachment->ID, true );
 }
 $wpdb->query( "DELETE FROM $wpdb->postmeta WHERE meta_key = '_thumbnail_id' AND post_id = $post_ID" );
 }
 add_action('before_delete_post', 'delete_post_and_attachments');