我正在将上载的附件存储到自定义目录下wp-content/uploads/my-directory/ 并将其价值存储在wp_postmeta 桌子当我删除帖子时，并不是从路径中删除附加文件。

所以我试着抓住delete_post 钩子从文件路径中删除文件：

<?php
/**
 * Delete Custom Attachment when deleting its post.
 *
 * @param integer $post_id Post ID.
 * 
 * @return void
 */
function wpse353942_delete_attachment( $post_id ) {
    if ( \'my-cpt\' !== get_post_type( $post_id ) ) {
        return;
    }

    $attachment = get_post_meta( $post_id, \'_attachment\', true ); // get the attachment URL.
    if ( ! $attachment ) {
        return;
    }

    $upload_dir = wp_get_upload_dir();
    unlink( $upload_dir[\'basedir\'] . \'/my-directory/\' . basename( $attachment ) );
}

add_action( \'delete_post\', \'wpse353942_delete_attachment\' );

我能做什么？