How is this done?

Hi there.
I’ve seen on various sites navigation like [url]http://www.url.com/?mod=about[/url]

How is that achieved?

My old “page.php” which would load i.e. page.php?p=about worked — but how is it achieved with just a ?mod=about

Thanks.

The page.php code:

[code=php]
<?php
if (isset($_GET[‘p’])) {
$p = (strstr($_GET[‘p’], “.php”)) ? $_GET[‘p’] : $_GET[‘p’].”.php”;
if (file_exists($p)) {
include $p;
}
else {
include “index.php”;
}
}
else {
include “index.php”;
}
?>
[/code]

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