Examples of PHP multi-threading (PHP multi-threading class)_PHP tutorial

/**

Class curl_multi{
         private $url_list=array();
         private $curl_setopt=array(
                'CURLOPT_RETURNTRANSFER' => 1,//The result is returned to the variable
               'CURLOPT_HEADER' => 0,//Whether the HTTP header needs to be returned
               'CURLOPT_NOBODY' => 0,//Whether the returned content is required
                'CURLOPT_FOLLOWLOCATION' => 0,//Automatic tracking
               'CURLOPT_TIMEOUT' => 6//Timeout time (s)
);
         function __construct($seconds=30){
               set_time_limit($seconds);
          }
            /*
* Set URL
* @list array
           */
          public function setUrlList($list=array()){
                   $this->url_list=$list;
          }
            /*
* Set parameters
* @cutPot array
           */
          public function setOpt($cutPot){
$this->curl_setopt=$cutPot+$this->curl_setopt;
          }
            /*
* Execute
* @return array
           */
Public function execute(){
                $mh=curl_multi_init();
foreach($this->url_list as $i=>$url){
                        $conn[$i]=curl_init($url);
foreach($this->curl_setopt as $key => $val){
                             curl_setopt($conn[$i],preg_replace('/(CURLOPT_w{1,})/ie','$0',$key),$val);
                                                                                                                          curl_multi_add_handle($mh,$conn[$i]);
               }
                 $active=false;
do{
                         $mrc=curl_multi_exec($mh,$active);
            }while($mrc == CURLM_CALL_MULTI_PERFORM);
     
​​​​​​while($active and $mrc ​​== CURLM_OK){
If(curl_multi_select($mh) != -1){
                      do{
$mrc=curl_multi_exec($mh,$active);
                                   }while($mrc == CURLM_CALL_MULTI_PERFORM);
                                                                                                                   }
                $res=array();
foreach($this->url_list as $i => $url){
                      $res[$i]=curl_multi_getcontent($conn[$i]);
                    curl_close($conn[$i]);
                     curl_multi_remove_handle($mh,$conn[$i]);//Release resources
               }
                curl_multi_close($mh);
                return $res;
          }
}