PHP5中可以使用新增的stream_socket_client()函數直接替換掉fsocketopen()。PHP5之前的版本，你需要自己動手，用sockets擴展解決問題。PHP5的先進之處在于，你可以用stream_select()處理幾乎所有的stream-例如你可以通過include STDIN用它接收鍵盤輸入并保存進數組，你還可以接收通過proc_open()打開的管道中的數據。

下面來分享一個PHP多線程類

代碼如下
* @title:      PHP多線程類(Thread)
* @version:    1.0
* @author:     phper.org.cn < web@phper.org.cn >
* @published:  2010-11-2
*
* PHP多線程應用示例：
*  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);
                }
            }
        }
    }
}