culr-php-

	//i.e. set_cookies_from_url("http://example.com/?username=user&auth=key');
	public function set_cookies_from_url($url)
	{
		$d=$this->get_remote_data($url, false, ["curl_opts"=>["CURLOPT_HEADERFUNCTION"=>
			( function ($ch, $headerLine) {
				if (preg_match('/^Set-Cookie:\s*([^;]*)/mi', $headerLine, $cookieArr) == 1)
				{
					$cookie = $cookieArr[1];
					$cookie_vars = explode('=', $cookie, 2);
					$this->example_cookies[$cookie_vars[0]] = $cookie_vars[1];
				}
				return strlen($headerLine); // Needed by curl
				}
			)
			]]
		);
		foreach($this->example_cookies as $key=>$name)
		{
			$this->set_cookie($key,$name, 86000, '/target_dir/');
		}
		$this->set_cookie("sample_confirm","1");
	}

	/*
			usage:
    list($curl_responses, $curl_errors) = $helpers->multi_curl($urls);

    foreach($urls as $key => $url)
    {
        if (!$curl_responses[$key]) $failed_urls[$key]=$urls[$key];
        else { $data=parse_response_into_candles( $curl_responses[$key], $key );  if($data) calcs($data, $key, $url); }
    }

    if ( ! empty( $failed_urls ) )
    {
        //make re-triger
        if (!$is_retrigger)  {
            echoEnabled('<h2 style="color:red;">Re-triggering requests:</h2> ['.  datet() .']');
            errorlog("Re-triggering cURL for these urls: \r\n".  print_r($failed_urls, true) . "\r\n\r\n");
            this_function($failed_urls, $is_retrigger=true);
        }
        //result if re-trigger done already
        else errorlog("After retrigger, still failed urls:\r\n" . print_r($failed_urls, true)  );
    }
   */
	public function multi_curl($urls)
	{
		$curl_responses	=[];
		$curl_errors	=[];
		$mch = curl_multi_init();
		$handlesArray=[];
		$curl_max_timeout = 60*60; //max 1 hr to run
		foreach ($urls as $key=> $url) {
			$ch = curl_init();
			curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
			curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
			curl_setopt($ch, CURLOPT_HEADER, false);
			// timeouts: https://thisinterestsme.com/php-setting-curl-timeout/   and https://stackoverflow.com/a/15982505/2377343
			curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $curl_max_timeout);
			curl_setopt($ch, CURLOPT_TIMEOUT, $curl_max_timeout);
			if (defined('CURLOPT_TCP_FASTOPEN')) curl_setopt($ch, CURLOPT_TCP_FASTOPEN, 1);
			curl_setopt($ch, CURLOPT_ENCODING, ""); // empty to autodetect | gzip,deflate
			curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
			curl_setopt($ch, CURLOPT_URL, $url);
			$handlesArray[$key] = $ch;
			curl_multi_add_handle($mch, $handlesArray[$key]);
		}

		// other approaches are deprecated ! https://stackoverflow.com/questions/58971677/
		do {
			$execReturnValue = curl_multi_exec($mch, $runningHandles);
		} while ($runningHandles>0);

		//exec now
		foreach($urls as $key => $url)
		{
			$handle = $handlesArray[$key];
			// Check for errors
			$curlError = curl_error($handle);
			if($curlError != "") {
				$curl_responses[$key]=false;
				$curl_errors[$key] = $curlError;
			}
			else{
				$curl_responses[$key] = curl_multi_getcontent($handle);
			}
			curl_multi_remove_handle($mch, $handle); curl_close($handle);
		}
		curl_multi_close($mch);
		return [$curl_responses, $curl_errors];
	}

	// for fast requests on same server
	public function curlFast($url, $params){
		if (!property_exists($this,'curlFastInited'))
		{
			$c = curl_init();
			curl_setopt($c, CURLOPT_RETURNTRANSFER, 1);
			curl_setopt($c, CURLOPT_HEADER, false);
			curl_setopt($c, CURLOPT_TIMEOUT, 9);
			curl_setopt($c, CURLOPT_HTTPGET, true);
			curl_setopt($c, CURLOPT_SSL_VERIFYHOST,false);
			curl_setopt($c, CURLOPT_SSL_VERIFYPEER,false);
			curl_setopt($c, CURLOPT_MAXREDIRS, 1);
			curl_setopt($c, CURLOPT_CONNECTTIMEOUT, 9);
			curl_setopt($c, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4 );
			curl_setopt($c, CURLOPT_ENCODING,  '');
			if (defined('CURLOPT_TCP_FASTOPEN')) curl_setopt($c, CURLOPT_TCP_FASTOPEN,  1);
			$this->curlFastInited =$c;
			register_shutdown_function( function(){ curl_close($this->curlFastInited); } );
		}
		curl_setopt($this->curlFastInited, CURLOPT_URL, $url);
		$data = curl_exec($this->curlFastInited);
		return $data;
	}