php多线程有几种实现方法

1、curl_multi方法

当需要多线程的时候，可以用curl_multi一次性请求多个操作来完成，但curl走的是网络通信，效率与可靠性就比较差了的。

function main(){     $sql = "select waybill_id,order_id from waybill where status>40 order by update_time desc limit 10 ";      $data = Yii::app()->db->createCommand($sql)->queryAll(); //yii 框架格式      foreach ($data as $k => $v) {         if ($k % 2 == 0) { //偶数发一个网址          $send_data[$k]['url'] = '';          $send_data[$k]['body'] = $v['waybill_id'];        } else { //奇数发送另外一个网址         $send_data[$k]['url'] = 'http://www.abc.com';          $send_data[$k]['body']=array($v['order_id'] => array('extra' => 16));       }     }    }

2、通过stream_socket_client 方式

function sendStream() {     $english_format_number = number_format($number, 4, '.', '');      echo $english_format_number;      exit();     $timeout = 10;<em style="color:transparent">来源[email protected]搞@^&代*@码网</em>     $result = array();     $sockets = array();     $convenient_read_block = 8192;     $host = "test.local.com";     $sql = "select waybill_id,order_id from xm_waybill where status>40 order by update_time desc limit 1 ";      $data = Yii::app()->db->createCommand($sql)->queryAll();     $id = 0;      foreach ($data as $k => $v) {       if ($k % 2 == 0) {         $send_data[$k]['body'] = NoticeOrder::getSendData($v['waybill_id']);        } else {         $send_data[$k]['body'] = array($v['order_id'] => array('extra' => 16));        }        $data = json_encode($send_data[$k]['body']);       $s = stream_socket_client($host . ":80", $errno, $errstr, $timeout, STREAM_CLIENT_ASYNC_CONNECT | STREAM_CLIENT_CONNECT);       if ($s) {          $sockets[$id++] = $s;         $http_message = "GET /php/test.php?data=" . $data . " HTTP/1.0\r\nHost:" . $host . "\r\n\r\n";          fwrite($s, $http_message);       } else {          echo "Stream " . $id . " failed to open correctly.";       }      }  }

3、通过多进程代替多线程

function daemon($func_name,$args,$number){   while(true){     $pid=pcntl_fork();     if($pid==-1){       echo "fork process fail";       exit();     }elseif($pid){//创建的子进程        static $num=0;       $num++;       if($num>=$number){         //当进程数量达到一定数量时候，就对子进程进行回收。         pcntl_wait($status);          $num--;       }      }else{ //为0 则代表是子进程创建的，则直接进入工作状态        if(function_exists($func_name)){         while (true) {           $ppid=posix_getpid();           var_dump($ppid);           call_user_func_array($func_name,$args);           sleep(2);         }       }else{         echo "function is not exists";       }       exit();       }   } }  function worker($args){    //do something  }  daemon('worker',array(1),2);

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