Codeigniter购物车类不能添加中文的解决方法

if ( ! preg_match("/^[".$this->product_name_rules."]+$/i", $items['name']))
{ 
     log_message('error', 'An invalid name was submitted as the product name: '.$items['name'].' The name can only contain alpha-numeric characters, dashes, underscores, colons, and spaces'); 
     return FALSE; 
}