php多进程几个例子

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.phprm.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:

<?php
//输出重定向到log文件
function echo_to_log($content) {
    global $current_pid;
    $logfile = __FILE__ . $current_pid . &#39;.log&#39;;
    $fp = fopen($logfile, &#39;a+&#39;);
    fwrite($fp, $content);
    fclose($fp);
}
ob_start(&#39;echo_to_log&#39;);
//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 &#39;fork failed &#39; . PHP_EOL;
        } else if ($pid) {
        } else {
            $pid = posix_getpid();
            echo &#39;child &#39; . $pid . &#39; &#39; . time() . PHP_EOL;
            sleep(rand(2, 5));
            echo &#39;child &#39; . $pid . &#39; done &#39; . time() . PHP_EOL;
            exit(0);
        }
    }
    do {
        $pid = pcntl_wait($status);
        echo &#39;child quit &#39; . $pid . PHP_EOL;
    } while ($pid > 0);
    echo &#39;parent done&#39; . 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 : &#39;Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2)&#39;;
        $curl = curl_init();
        curl_setopt($curl, CURLOPT_URL, $url);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($curl, CURLOPT_TIMEOUT, 5);
        curl_setopt($curl, CURLOPT_USERAGENT, (www . phprm . 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.phprm.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:

<?php
    /** 
     * @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 &#39;thread.class.php&#39;;
     *  $thread = new thread();
     *  $thread->addthread(&#39;action_log&#39;,&#39;a&#39;);
     *  $thread->addthread(&#39;action_log&#39;,&#39;b&#39;);
     *  $thread->addthread(&#39;action_log&#39;,&#39;c&#39;);
     *  $thread->runthread();
     *
     *  function action_log($info) {
     *   $log = &#39;log/&#39; . microtime() . &#39;.log&#39;;
     *   $txt = $info . "rnrn" . &#39;Set in &#39; . Date(&#39;h:i:s&#39;, time()) . (double)microtime() . "rn";
     *   $fp = fopen($log, &#39;w&#39;);
     *   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[&#39;flag&#39;])) {
                $flag = intval($_GET[&#39;flag&#39;]);
            }
            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[&#39;HTTP_HOST&#39;], $_SERVER[&#39;SERVER_PORT&#39;]);
                    if ($fp) {
                        $out = "GET {$_SERVER[&#39;PHP_SELF&#39;]}?flag=$i HTTP/1.1rn";
                        $out.= "Host: {$_SERVER[&#39;HTTP_HOST&#39;]}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.phprm.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 
添加如下代码:

extension = "pthreads.so"

PHP扩展下载：https://github.com/krakjoe/pthreads

PHP手册文档：http://php.net/manual/zh/book.pthreads.php                                        

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