关于include文件赋值的有关问题

关于include文件赋值的问题

<br />include文件：<br /><?php    <br />    $_CFG = array();<br />    $_CFG['DB_HOST'] = 'localhost';<br />    $_CFG['DB_USER'] = 'root';<br />    $_CFG['DB_PASWORD'] = 'liujianian';<br />    $_CFG['DB_NAME'] = 'commerceClub';<br />

<br /><?php<br /><br />class conf{<br />	protected static $ins = null;<br />	protected  $data = array();<br />	final protected function _construct(){<br />		//一次性将配置文件读取进来<br />		include('./config.php');<br />		$this->data = $_CFG;<br />	}<br />	final protected function _clone(){<br />	<br />	}<br />	public static function getIns(){<br />		if(self::$ins instanceof self){<br />			return self::$ins;<br />		}else{<br />			self::$ins = new self();<br />			return self::$ins;<br />		}<br />	}<br />}<br />$conf = conf::getIns();<br />print_r($conf);<br />

测试结果是：
conf Object ( [data:protected] => Array ( ) ) 
为什么数组$_CFG中的值没有被赋给全局变量protected   $data呢？
求解释
------解决方案--------------------
因为你漏掉了一个下划线
__construct
__clone