php多任务程序实例解析

本文以实例简单解析了php多任务程序的实现方法，具体代码如下：

<?phperror_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* */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);}