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：

<?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
*
*/
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);
}