php中英文判断

$str = ‘中国’;
if (preg_match(“/^[\x7f-\xff]+$/”, $str))
{ //又是一年风起时兼容gb2312,utf-8
echo云南大学在哪 “zhongwen”;
}
el
{
echo “血栓性外痔ydraws增员ingwen “;
}
作者“技术人生”