关于include文件赋值的问题

<?php        
$_CFG = array();    
$_CFG[&#39;DB_HOST&#39;] = &#39;localhost&#39;;    
$_CFG[&#39;DB_USER&#39;] = &#39;root&#39;;    
$_CFG[&#39;DB_PASWORD&#39;] = &#39;liujianian&#39;;    
$_CFG[&#39;DB_NAME&#39;] = &#39;commerceClub&#39;;

<?php
class conf{ protected static $ins = null; 
protected  $data = array(); 
final protected function _construct(){ 
//一次性将配置文件读取进来 
include(&#39;./config.php&#39;); $this->data = $_CFG; 
} 
final protected function _clone(){ 
} 
public static function getIns(){ 
if(self::$ins instanceof self){ return self::$ins; }
else{
self::$ins = new self(); return self::$ins; } }}
$conf = conf::getIns();print_r($conf);

conf Object ( [data:protected] => Array ( ) )

__construct  
__clone