code: public function setOpt(int $option, $value):void {
  		curl_multi_setopt($this->mh, $option, $value);
  	}
docs: Set an option for the cURL multi handle, one of the CURLMOPT_* constants.
  
  @see http://php.net/manual/en/function.curl-multi-setopt.php
  @throws CurlException on failure