Qiniu\Storage\BucketManager::delete PHP Method

    public function delete($bucket, $key)
    {
        $path = '/delete/' . \Qiniu\entry($bucket, $key);
        list(, $error) = $this->rsPost($path);
        return $error;
    }

 /**
  * 删除图片
  * $param string $fileName 图片名称
  * return null
  */
 public function deleteFile($fileName)
 {
     $bucketMgr = new BucketManager($this->auth);
     $err = $bucketMgr->delete($this->bucket, $fileName);
     if ($err !== null) {
         return $err;
     } else {
         return "Success!";
     }
 }