多线程phpsingleton
A.php
<code><?php class Singleton { private static $instance; private function __construct() { echo "This is ok!\r\n"; } public static function GetInstance() { if (!(self::$instance instanceof self)) { self::$instance = new self(); } return self::$instance; } } </code></code>B.php
<code><?phprequire_once ('A.php');class AsyncOperation extends Thread { public function __construct($arg){ $this->arg = $arg; } public function run(){ if($this->arg){ Singleton::GetInstance(); } }}$arr = array();for($i=0;$istart();}</code>本人写java的 看到php的单例如A.php表示，但是实际在pthreads扩展下多线程跑的时候，会打印出内容，多次构造该实例。求各位phper解答疑问
对java熟悉点，java中
<code>public class Singleton{ private static Object instance = null; public Object getInstance(){ if(instance==null){ synchronized(Singleton.class){ if(instance==null){ instance = new Singleton(); } } } return instance }}</code>
