Example of Curl and Multi Curl in PHP

Curl.php

<?php

namespace App\Library\Curl;

class Curl {

  private static $cookies, $proxy, $verbose, $mobile;

  public static function setCookie($cookie_name){
    self::$cookies = (dirname(getcwd()) . '/storage/app/cookies/'. $cookie_name . '.txt');
  }

  public static function getCookie(){
    return self::$cookies;
  }

  public static function setProxy($proxy){
    self::$proxy = $proxy;
  }

  public static function verbose(){
    self::$verbose = true;
  }

  public static function mobileView()
  {
    self::$mobile = true;
  }

  public static function request($user_options, $verbose = false){

    //set the options
    $default_options[CURLOPT_FOLLOWLOCATION] = 1;
    $default_options[CURLOPT_RETURNTRANSFER] = 1;
    $default_options[CURLOPT_SSL_VERIFYHOST] = 2;
    $default_options[CURLOPT_SSL_VERIFYPEER] = 1;
    $default_options[CURLOPT_CAINFO]         = dirname(getcwd()) . '/storage/app/CA/cacert.pem';

    if (! self::$mobile) {
      $default_options[CURLOPT_USERAGENT] = 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.155 Safari/537.36';
    } else {
      $default_options[CURLOPT_USERAGENT] = 'Mozilla/5.0 (Linux; Android 4.4.4; Nexus 5 Build/KTU84P) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.114 Mobile Safari/537.36';
    }

    $default_options[CURLOPT_ENCODING]       = 'gzip,deflate';
    $default_options[CURLOPT_HEADER]         = 0;
    $default_options[CURLOPT_COOKIEFILE]     = self::$cookies;
    $default_options[CURLOPT_COOKIEJAR]      = self::$cookies;

    if(self::$verbose){
      $default_options[CURLOPT_VERBOSE] = 1;
    }

    if(isset(self::$proxy)){
      $default_options[CURLOPT_SSL_VERIFYPEER] = 0;
      $default_options[CURLOPT_PROXY] = self::$proxy;
    }

    $options = $user_options + $default_options;

    //do curl
    $ch = curl_init();
    curl_setopt_array($ch, $options);
    $output = curl_exec($ch);

    if($verbose){
      $info = curl_getinfo($ch);
      $errno = curl_errno($ch);
      $error = curl_error($ch);
      $response = compact('info', 'errno', 'error', 'output');
    } else {
      $response = $output;
    }

    curl_close($ch);

    return $response;

  }

  public function multiRequest($data, $options = array()){

    // array of curl handles
    $curly = array();
    // data to be returned
    $result = array();

    // multi handle
    $mh = curl_multi_init();

    // loop through $data and create curl handles
    // then add them to the multi-handle
    foreach ($data as $id => $d) {

      $curly[$id] = curl_init();

      $url = (is_array($d) && !empty($d['url'])) ? $d['url'] : $d;
      curl_setopt($curly[$id], CURLOPT_URL, $url);
      curl_setopt($curly[$id], CURLOPT_HEADER, 0);
      curl_setopt($curly[$id], CURLOPT_RETURNTRANSFER, 1);
      curl_setopt($curly[$id], CURLOPT_COOKIEFILE, self::$cookies);
      curl_setopt($curly[$id], CURLOPT_COOKIEJAR, self::$cookies);

      // post?
      if (is_array($d)) {
        if (!empty($d['post'])) {
          curl_setopt($curly[$id], CURLOPT_POST, 1);
          curl_setopt($curly[$id], CURLOPT_POSTFIELDS, $d['post']);
        }
      }

      // extra options?
      if (!empty($options)) {
        curl_setopt_array($curly[$id], $options[$id]);
      }

      curl_multi_add_handle($mh, $curly[$id]);
    }

    // execute the handles
    $running = null;
    do {
      curl_multi_exec($mh, $running);
    } while($running > 0);


    // get content and remove handles
    foreach($curly as $id => $c) {
      $result[$id] = curl_multi_getcontent($c);
      curl_multi_remove_handle($mh, $c);
    }

    // all done
    curl_multi_close($mh);

    return $result;

  }

}