php的SDK中有个错误

    public function copy_object($from_bucket,$from_object,$to_bucket,$to_object,$options = NULL){
        //options
        $this->validate_options($options);

        if(!$options){
            $options = array();
        }

        //from bucket
        $this->is_empty($from_bucket,OSS_BUCKET_IS_NOT_ALLOWED_EMPTY);

        //to bucket
        $this->is_empty($to_bucket,OSS_BUCKET_IS_NOT_ALLOWED_EMPTY);

        //from object
        $this->is_empty($from_object,OSS_OBJECT_IS_NOT_ALLOWED_EMPTY);

        //to object
        $this->is_empty($to_object,OSS_OBJECT_IS_NOT_ALLOWED_EMPTY);

        $options[self::OSS_BUCKET] = $from_bucket;
        $options[self::OSS_METHOD] = 'PUT';
        $options[self::OSS_OBJECT] = $to_object;
        $options[self::OSS_HEADERS] = array(self::OSS_OBJECT_COPY_SOURCE => '/'.$from_bucket.'/'.$from_object);
        $response = $this->auth ( $options );

        $this->log(($response->isOK () ? OSS_COPY_OBJECT_SUCCESS : OSS_COPY_OBJECT_FAILED)." Response: [" . $response->body . "]", $options );
        return $response;
    }

$options[self::OSS_BUCKET] = $from_bucket;

$options[self::OSS_BUCKET] = $to_bucket;