php实现多线程

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PHP本身是不支持多线程的,我们可以通过php自身函数虚拟处理啊多线程。下面介绍三个函数来实现多进程。

一、fsockopen，打开一个网络连接或者一个Unix套接字连接。其中stream_set_blocking() - 为资源流设置阻塞或者阻塞模式

* @title:   PHP多线程类(Thread) * @version:  1.0 *  * 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'],$_SERVER['SERVER_PORT']);        stream_set_blocking($fp,0);        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);        }      }    }  }}

二、stream_socket_client，PHP5中可以使用新增的stream_socket_client()函数直接替换掉fsocketopen()。其中stream_set_blocking() - 为资源流设置阻塞或者阻塞模式

<?php$fp = stream_socket_client("tcp://www.example.com:80", $errno, $errstr, 30);stream_set_blocking($fp,0);if (!$fp) {    echo "$errstr ($errno)<br />\n";} else {    fwrite($fp, "GET / HTTP/1.0\r\nHost: www.example.com\r\nAccept: */*\r\n\r\n");    while (!feof($fp)) {        echo fgets($fp, 1024);    }    fclose($fp);}?>

三、curl_multi，当需要多线程的时候，可以用curl_multi一次性请求多个操作来完成，但curl走的是网络通信，效率与可靠性就比较差了的。

function sendMulitRequest($send_data){     $params = array();     $curl = $text = array();     $handle = curl_multi_init();       foreach ($data as $k => $v) {         if (empty($v['url'])) {           $v['url'] = "http://www.xxx.com"; //if url is empty,set defalut url         }         $reqBody = json_encode($v['body']);         $reqStream = array(           'body' => $reqBody,       );        $encRequest = base64_encode(json_encode($reqStream));        $params['data'] = $encRequest;       $curl[$k] = curl_init();       curl_setopt($curl[$k], CURLOPT_URL, $v['url']);       curl_setopt($curl[$k], CURLOPT_POST, TRUE);       curl_setopt($curl[$k], CURLOPT_HEADER, 0);       curl_setopt($curl[$k], CURLOPT_POSTFIELDS, http_build_query($params));       curl_setopt($curl[$k], CURLOPT_RETURNTRANSFER, 1);       curl_multi_add_handle($handle, $curl[$k]);     }     $active = null;       do {         $mrc = curl_multi_exec($handle, $active);       } while ($mrc == CURLM_CALL_MULTI_PERFORM);     while ($active && $mrc == CURLM_OK) {         if (curl_multi_select($handle) != -1) {           do {             $mrc = curl_multi_exec($handle, $active);           } while ($mrc == CURLM_CALL_MULTI_PERFORM);         }       }     foreach ($curl as $k => $v) {        if (curl_error($curl[$k]) == "") {         $text[$k] = (string) curl_multi_getcontent($curl[$k]);        }        curl_multi_remove_handle($handle, $curl[$k]);        curl_close($curl[$k]);     }     curl_multi_close($handle);      return $text;    }

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