[PHP] Remote File Variable Injection Safety?

[Daniel Kolbo]

Hello,

suppose there is a file at http://otherhost.com/remote.php that looks 
like this:

<?php
if (!isset($safe_flag))
{
   die("hacking attempt");
}
echo "You are in";
?>

Suppose i executed the following php file at http://myhost.com/local.php

<?php
require_once("http://otherhost.com/remote.php";);
?>

Is there any way to get local.php to display "You are in", by only 
modifying local.php?  That is, is there a way to set $safe_flag on the 
remote host as one requests a file from the remote host from within 
local.php?

I have genuine, academic, non-belligerent intentions when asking this 
question.

Thanks,
dK