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
<?phpheader("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>";}
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