wordpress删除文章时同时删除文章的图片

wordpress 在删除文章的时候，并不会从服务器上将文章的图片和缩略图删除掉，久而久之就会产生很多没必要的图片，若是网站量大了，还会占用空间，将下面的代码放到 function.php 文件夹中就可以了。

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');