[php] "like" On Each Page Without Editing Code: P

This is a simple code that I made for my site, but bring them if they need it ...
what it does is, it adds to any page you like add the code, without changing anything.

<?php
function like(){
function url()
{
return 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
}
$url =  url();
[hide]return '<iframe src="http://www.facebook.com/plugins/like.php?href='.$url.'&amp;layout=standard&amp;show_faces=true&amp;width=450&amp;action=like&amp;colorscheme=light&amp;height=80" scrolling="no" frameborder="0" style="border:none; overflow:hidden; width:450px; height:80px;" allowTransparency="true"></iframe>';
}
echo like();
?>

PHP:

you can include on each page using this code, keeping the above code in a file called like.php

<?php
include("like.php");
?>

PHP:

 

So bad, hope facebook doesn't figure out your doing this.....