[8088]

More or less. Here's a quick and dirty with help of DarthNinja's code:

PHP Code:

<?php
if ($_GET['s'])
{
    $steam_id=strtolower($_GET['s']);
    if (substr($steam_id,0,7)=='steam_0') {
        $tmp=explode(':',$steam_id);
    }
    if ((count($tmp)==3) && is_numeric($tmp[1]) && is_numeric($tmp[2])){

        //The 'Magic Number': 76561197960265728
        //Split up so it can be calculated without an extension.



        $steamidCalc=($tmp[2]*2)+$tmp[1]; //Work out step 1
        $calckey='1197960265728'; //Second bit of the magic number
        $pre='7656'; //First bit of the magic number

        $steamcid=$steamidCalc+$calckey; //works out the ending of the steam community ID

        $link="http://steamcommunity.com/profiles/";
        //echo $link; echo $pre; echo $steamcid;
        header('Location: http://steamcommunity.com/profiles/'.$pre.$steamcid);

    };
}
?>

Usage: steamid.php?s=STEAM_0:1:23456