php 模擬多線程

時間 2019-11-11

標籤 php 模擬多線程欄目 PHP 简体版

原文原文鏈接

一、linux下的php多線程php

下面所講的東西是源自php的pcntl_fork函數.由於這個函數依賴操做系統fork的實現,因此本文所講的東西只適用於linux/unix。那麼先看看這個函數的用法吧.php手冊上是這麼說的:html

1linux

2sql

3json

4多線程

5app

6socket

7函數

8spa

<?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}?>

經過pcntl_fork建立一個子進程,若是返回值是-1的話,那麼說明子進程建立失敗.建立成功的進程id會返回給父進程,0返回給子進程.很差理解吧，因此應該這樣寫：

<?php
$pid = pcntl_fork();if($pid == -1){         //建立失敗咱就退出唄,沒啥好說的
         die('could not fork');
}else{        if($pid){                //從這裏開始寫的代碼是父進程的,由於寫的是系統程序,記得退出的時候給個返回值
                exit(0);
        }        else{                //從這裏開始寫的代碼都是在新的進程裏執行的,一樣正常退出的話,最好也給一個返回值
                exit(0);
        }
}?>

這樣一改好理解多了,若是你父進程但願知道子進程正常退出的話,能夠加上前面的pcntl_wait。

2.經過stream_socket_client 方式

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); 
   
  }

三、經過多進程代替多線程

function daemon($func_name,$args,$number){ 
  while(true){ 
    $pid=pcntl_fork(); 
    if($pid==-1){ 
      echo "fork process fail"; 
      exit(); 
    }elseif($pid){//建立的子進程 
   
      static $num=0; 
      $num++; 
      if($num>=$number){ 
        //當進程數量達到必定數量時候，就對子進程進行回收。 
        pcntl_wait($status); 
   
        $num--; 
      }  
    }else{ //爲0 則表明是子進程建立的，則直接進入工做狀態 
   
      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);