按书上代码调试有些问题，修正成如下正确代码：

当前网页必须为UTF-8格式才能正适用：

<?PHP if($_GET['act']=="validate"){ //echo $_POST['name']; $t=mb_convert_encoding($_POST['name'],"GBK","utf-8"); //若当前网页为gb2312格式，则需要注释掉这一行 if(preg_match("/^[".chr(0xa1)."-".chr(0xff)."]+$/",$t)) echo "yes"; else echo "no"; die(); } ?> <form action="?act=validate" method="post"> <input name="name" type="text" /> <input type="submit" value="yz" /> </form>