<body>
<?php
print('Well,hello<b><font color="#ff0000">'.urldecode($_GET['person']).'</font></b>,nice to meet you!');
print('<br />');
print('<a href="who_are_you.php?person='.urlencode($_GET['person']).'">Back to Who Are You ?</a>');
?>
</body>
</html>
第一次运行时浏览器提示:Notice: Undefined index: person in c:\inetpub\wwwroot\myphp\old\index.php on line 16