php多任务程序的实现

<?php
error_reporting(E_ALL);
set_time_limit(0);

/**
 * php多任务程序的实现
 * 借助proc_open
 * 其实该叫进程(process)
 * 能启动多进程，你可以使用你的想象力做你想做的了，以后再写个能用的
 * 如果你是在linux上跑php，并且启用pcntl模块后，使用pcntl函数该更好
 *
 * 在网上搜索很多关于php多任务的，中文的很难找到一个，找到的也多是瞎扯蛋
 */
class Thread {
    protected $_pref; // process reference

    protected static $_instance = null;
    protected $_pipes;
    
    private function __construct() {
        $this->_pref = 0;
    }
    
    public static function getInstance($file) {
        if (null == self::$_instance) {
            self::$_instance = new self;
        }
        
        $descriptor = array(
        0 => array("pipe", "r"),
        1 => array("pipe", "w"),
        2 => array("file", "./error-output.txt", "a"),
        );
        self::$_instance->_pref = proc_open("php -q $file", $descriptor, self::$_instance->_pipes);
        return true;
    }
    
    public function __destruct() {
        proc_close($this->_pref);
        $this->_pref = null;
    }
}

// 测试代码

$file = __FILE__;

if(empty($argv[1])) {
    $t2 = Thread::getInstance("$file 1");
    $t3 = Thread::getInstance("$file 2");
    $t4 = Thread::getInstance("$file 3");
    $t5 = Thread::getInstance("$file 4");
    $t5 = Thread::getInstance("$file 5");
    $t5 = Thread::getInstance("$file 6");
    $t2 = Thread::getInstance("$file 7");
    $t3 = Thread::getInstance("$file 8");
    $t4 = Thread::getInstance("$file 9");
    $t5 = Thread::getInstance("$file 10");
    $t5 = Thread::getInstance("$file 11");
    $t5 = Thread::getInstance("$file 12");
    echo "Main thread done\n";
} else {
    $somecontent = "\r\n//~~~~~~~~~~~~-这次请求序号是：" . $argv[1];
    sleep(mt_rand(0, 3));
    $handle = fopen($file, 'a+');
    fwrite($handle, $somecontent);
}