check.php
<html> <body> <form action="test.php" method="post"> message<input type="text" name="name" value="123456" /> <input type="submit" value="submit" /> </form> </body> </html>
test.php
<?php header("Content-type:text/html;charset=‘utf8‘"); error_reporting(E_ALL); $url = parse_url($_SERVER[‘HTTP_REFERER‘]); //print_r($url); if($url[‘host‘] != "localhost"){ echo "<script>alert(‘host error.‘);history.go(-1);</script>"; exit(0); }else{ echo "<script>alert(‘host right.‘);</script>"; echo "<h1>Hello World!</h1>"; }
原文：http://www.cnblogs.com/myall/p/4781924.html