php 模拟多线程

1、linux下的php多线程

下面所讲的东西是源自php的pcntl_fork函数.因为这个函数依赖操作系统fork的实现,所以本文所讲的东西只适用于linux/unix。那么先看看这个函数的用法吧.php手册上是这么说的:

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<?php $pid = pcntl_fork();if ($pid == -1) {         die('could not fork'); } else if ($pid) {         // we are the parent          pcntl_wait($status); / /Protect against Zombie children} else {         // we are the child}?>

通过pcntl_fork创建一个子进程,如果返回值是-1的话,那么说明子进程创建失败.创建成功的进程id会返回给父进程,0返回给子进程.不好理解吧，所以应该这样写：

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<?php $pid = pcntl_fork();if($pid == -1){         //创建失败咱就退出呗,没啥好说的          die('could not fork'); }else{        if($pid){                //从这里开始写的代码是父进程的,因为写的是系统程序,记得退出的时候给个返回值                 exit(0);         }        else{                //从这里开始写的代码都是在新的进程里执行的,同样正常退出的话,最好也给一个返回值                 exit(0);         } }?>

这样一改好理解多了,如果你父进程希望知道子进程正常退出的话,可以加上前面的pcntl_wait。

2.通过stream_socket_client 方式

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function sendStream() {     $english_format_number = number_format($number, 4, '.', '');         echo $english_format_number;      exit();     $timeout = 10;     $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 " . $id . " failed to open correctly.";       }      }         while (count($sockets)) {           $read = $sockets;           stream_select($read, $w = null, $e = null, $timeout);        if (count($read)) {          /* stream_select generally shuffles $read, so we need to          compute from which socket(s) we're reading. */         foreach ($read as $r) {               $id = array_search($r, $sockets);           $data = fread($r, $convenient_read_block);           if (strlen($data) == 0) {             echo "Stream " . $id . " closes at " . date('h:i:s') . ".<br>  ";             fclose($r);              unset($sockets[$id]);           } else {             $result[$id] = $data;           }         }       } else {          /* A time-out means that *all* streams have failed          to receive a response. */         echo "Time-out!\n";         break;       }      }      print_r($result);       }

3、通过多进程代替多线程

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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);

 

来源：https://www.php.cn/php-weizijiaocheng-381235.html