WordPress在删除文章时，文章内所上传到媒体库的图片等附件不会自动删除，时间久了之后占用了网站空间，备份网站文件也不划算。以下的代码可以实现在删除文章时自动删除文章图片附件以及特色图片，将代码放到当前主题inc/fn.php（wordpress 4.4.1版本），如果是老版本则修改functions.php即可。
代码如下：
function delete_post_and_attachments($post_ID) {
global $wpdb;
$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 );
}
$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’);
