CartTool.class.php代码如下：
class CartTool extends Think{
private static $ins = null;
private $items = array();
public $sing = 0;
protected function __construct(){
$this->sing = mt_rand(1, 20000);
}
public static function get_ins(){
if(!(self::$ins instanceof self)){
self::$ins = new self();
}
return self::$ins;
}
public static function get_cart(){
if(!isset($_SESSION['cart']) || !($_SESSION['cart'] instanceof self)){
$_SESSION['cart'] = self::get_ins();
}
return $_SESSION['cart'];
}
} 最佳答案
