php在线代理转向代码

<?php
if ($_REQUEST[url])
{
header(Location:http://bcd.allowed.org/0/?url=.base64_encode(strrev($_REQUEST[url])));
}
else
{
echo "<form method=POST action=proxy.php>
url:<input name=url type=text value=\"\" />
<input type=submit value=\"go\" />
</form>";
}
?>