php多进程几个例子

时间：2015-01-23 来源：西部数据作者：西部数据

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.phpfensi.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($curl, CURLOPT_USERAGENT, (www.phpfensi.com)$userAgent);

      $result = curl_exec($curl);

      curl_close($curl);

      return $result;

  }

  for ($i=0; $i < 100; $i++)

  {

      $urls_array[] = array("name" => "baidu", "url" => "http://www.phpfensi.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.phpfensi.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