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php多进程几个例子

发布时间:2022-01-21 13:54 所属栏目:121 来源:互联网
导读:php多进程这个东西先是在java中有不过现在高版本的php也支持多进程这个功能,但经过测试性能不如j(www.Cuoxin.com)ava了希望后期有所提高了,下面我们一起来看看我整理了几个关于php多进程例子,希望能帮助你理解多线程. php多进程的实现依赖于pcntl扩展,编译PH
  php多进程这个东西先是在java中有不过现在高版本的php也支持多进程这个功能,但经过测试性能不如j(www.Cuoxin.com)ava了希望后期有所提高了,下面我们一起来看看我整理了几个关于php多进程例子,希望能帮助你理解多线程.
 
  php多进程的实现依赖于pcntl扩展,编译PHP的时候,可以加上’–enable-pcntl’或者也可以单独编译.
 
  有三点需要注意:
 
  1.子进程不在执行fork之前的代码,只是把父进程的内存状况复制一份新的,所以,关于子进程的个性化设置需要单独设置.
 
  2.输出重定向,程序中使用echo,或造成命令行的混乱,影响分辨,可以用ob_start重定向到log文件,当然,你直接使用log是更好的办法,此实例中log文件,按照进程pid分组.
 
  3.父进程没有代码执行,将可能提前退出,子进程可能成为孤儿进程.
 
  demo接收:
 
  用10个子进程来处理输出任务,任务总量是1000,然后,按照任务数平均分到十个子进程当中去,代码如下:
 
   //输出重定向到log文件                    
  function echo_to_log($content){
      global $current_pid;
      $logfile =  __FILE__ . $current_pid .  '.log';
      $fp = fopen($logfile, 'a+');
      fwrite($fp, $content);
      fclose($fp);
  }
                                                                                    
  ob_start('echo_to_log');
  //获取当前进程pid
  $current_pid = getmypid();
  $fork_nums = 10;
  $total = 1000;
                                                                                    
  for($i = 0; $i < $fork_nums; $i++){
      $pid = pcntl_fork();
      //等于0时,是子进程
      if($pid == 0){
          $current_pid = $pid;
          do_task($i);
       //大于0时,是父进程,并且pid是产生的子进程的PID
      } else if($pid > 0) {
      }
  }
                                                                                    
  //任务函数
  function do_task($task_num){
      global $total;
      $start = $total / 10 * $task_num;
      $end = $total / 10 * ($task_num + 1);
      for(;$start<$end;$start++){
          echo $task_num . " " . $start . "\n";
      }
      //子进程执行完任务以后终止,当然你可以返回主进程的代码部分做相关操作。
      exit();
  }
  多进程控制的框架代码,留着备查,代码如下:
 
  declare(ticks=1);
  function sigHandler($signal)
  {
      echo "a child exited\n";
  }
  pcntl_signal(SIGCHLD, sigHandler, false);
  echo "this is " . posix_getpid() . PHP_EOL;
  for($i=0; $i<3; $i++)
  {
      $pid = pcntl_fork();
      if($pid == -1)  
      {    
          echo 'fork failed ' . PHP_EOL;
      }    
      else if($pid)
      {    
      }    
      else
      {    
          $pid = posix_getpid();
          echo 'child ' . $pid . ' ' . time() . PHP_EOL;
          sleep(rand(2,5));
          echo 'child ' . $pid . ' done ' . time() . PHP_EOL;
          exit(0);
      }    
  }
  do
  {
      $pid = pcntl_wait($status);  
      echo 'child quit ' . $pid . PHP_EOL;
  }while($pid > 0);  
  echo 'parent done' . PHP_EOL;
  例子,给出一段PHP多线程、与For循环,抓取百度搜索页面的PHP代码示例,代码如下:
 
  <?php
    class test_thread_run extends Thread  
    {
        public $url;
        public $data;
  
        public function __construct($url)
        {
            $this->url = $url;
        }
  
        public function run()
        {
            if(($url = $this->url))
            {
                $this->data = model_http_curl_get($url);
            }
        }
    }
  
    function model_thread_result_get($urls_array)  
    {
        foreach ($urls_array as $key => $value)  
        {
            $thread_array[$key] = new test_thread_run($value["url"]);
            $thread_array[$key]->start();
        }
  
        foreach ($thread_array as $thread_array_key => $thread_array_value)  
        {
            while($thread_array[$thread_array_key]->isRunning())
            {
                usleep(10);
            }
            if($thread_array[$thread_array_key]->join())
            {
                $variable_data[$thread_array_key] = $thread_array[$thread_array_key]->data;
            }
        }
        return $variable_data;
    }
  
    function model_http_curl_get($url,$userAgent="")  
    {
        $userAgent = $userAgent ? $userAgent : 'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2)';  
        $curl = curl_init();
        curl_setopt($curl, CURLOPT_URL, $url);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($curl, CURLOPT_TIMEOUT, 5);
        curl_setopt($curl, CURLOPT_USERAGENT, (www.Cuoxin.com)$userAgent);
        $result = curl_exec($curl);
        curl_close($curl);
        return $result;
    }
  
    for ($i=0; $i < 100; $i++)  
    {  
        $urls_array[] = array("name" => "baidu", "url" => "http://www.Cuoxin.com/s?wd=".mt_rand(10000,20000));
    }
  
    $t = microtime(true);
    $result = model_thread_result_get($urls_array);
    $e = microtime(true);
    echo "多线程:".($e-$t)."\n";
  
    $t = microtime(true);
    foreach ($urls_array as $key => $value)  
    {
        $result_new[$key] = model_http_curl_get($value["url"]);
    }
    $e = microtime(true);
    echo "For循环:".($e-$t)."\n";
  ?>
  PHP多线程类,代码如下:
 
  /**
   * @title:  PHP多线程类(Thread)
   * @version: 1.0
   * @author:   < web@ >
   * @published: 2010-11-2
   *  
   * PHP多线程应用示例:
   *  require_once 'thread.class.php';
   *  $thread = new thread();
   *  $thread->addthread('action_log','a');
   *  $thread->addthread('action_log','b');
   *  $thread->addthread('action_log','c');
   *  $thread->runthread();
   *   
   *  function action_log($info) {
   *   $log = 'log/' . microtime() . '.log';
   *   $txt = $info . "rnrn" . 'Set in ' . Date('h:i:s', time()) . (double)microtime() . "rn";
   *   $fp = fopen($log, 'w');
   *   fwrite($fp, $txt);
   *   fclose($fp);
   *  }
   */
  class thread {
  
      var $hooks = array();
      var $args = array();
       
      function thread() {
      }
       
      function addthread($func)
      {
       $args = array_slice(func_get_args(), 1);
       $this->hooks[] = $func;
    $this->args[] = $args;
    return true;
      }
       
      function runthread()
      {
       if(isset($_GET['flag']))
       {
        $flag = intval($_GET['flag']);
       }
       if($flag || $flag === 0)
    {
     call_user_func_array($this->hooks[$flag], $this->args[$flag]);
    }
       else  
       {
           for($i = 0, $size = count($this->hooks); $i < $size; $i++)
           {
            $fp=fsockopen($_SERVER['HTTP_HOST'],$_SERVER['SERVER_PORT']);
            if($fp)
            {
             $out = "GET {$_SERVER['PHP_SELF']}?flag=$i HTTP/1.1rn";
             $out .= "Host: {$_SERVER['HTTP_HOST']}rn";
             $out .= "Connection: Closernrn";
                   fputs($fp,$out);
                   fclose($fp);
            }
           }
       }
      }
  }
  使用方法,代码如下:
 
  $thread = new thread();
  $thread->addthread('func1','info1');
  $thread->addthread('func2','info2');
  $thread->addthread('func3','info3');
  $thread->runthread();
  说明:addthread是添加线程函数,第一个参数是函数名,之后的参数(可选)为传递给指定函数的参数.
 
  runthread是执行线程的函数.
 
  在linux系统中需要配置安装一下pthreads
 
  1、扩展的编译安装(Linux),www.Cuoxin.com 编辑参数 --enable-maintainer-zts 是必选项,代码如下:
 
  cd /Data/tgz/php-5.5.1
  ./configure --prefix=/Data/apps/php --with-config-file-path=/Data/apps/php/etc --with-mysql=/Data/apps/mysql --with-mysqli=/Data/apps/mysql/bin/mysql_config --with-iconv-dir --with-freetype-dir=/Data/apps/libs --with-jpeg-dir=/Data/apps/libs --with-png-dir=/Data/apps/libs --with-zlib --with-libxml-dir=/usr --enable-xml --disable-rpath --enable-bcmath --enable-shmop --enable-sysvsem --enable-inline-optimization --with-curl --enable-mbregex --enable-fpm --enable-mbstring --with-mcrypt=/Data/apps/libs --with-gd --enable-gd-native-ttf --with-openssl --with-mhash --enable-pcntl --enable-sockets --with-xmlrpc --enable-zip --enable-soap --enable-opcache --with-pdo-mysql --enable-maintainer-zts
  make clean
  make
  make install        
  
  unzip pthreads-master.zip
  cd pthreads-master
  /Data/apps/php/bin/phpize
  ./configure --with-php-config=/Data/apps/php/bin/php-config
  make
  make install
  vi /Data/apps/php/etc/php.ini 

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