/**
* 返回客户端程序期望服务器返回哪个国家的语言文档
*
* Accept-Language: en-us,zh-cn
*
* @return string
*/
public static function get_accept_language()
{
if (!self::$_language) {
$_language = explode(',', self::get_server('HTTP_ACCEPT_LANGUAGE', ''));
self::$_language = $_language[0] ? $_language[0] : 'zh-cn';
}
return self::$_language;
}