Module-Util/modules/util/steamid_converter.php

<?php /*
SteamID conversion tool by 8088 & KoST
For more info, visit AlliedModders @ http://forums.alliedmods.net/showthread.php?t=60899
*/
?>
<form method="get" action="">
	<div >
		<fieldset style="color:white;background-color:DarkSlateGray">
			<legend  style="background-color:DarkSlateGray;color:white">Input</legend>
			<table>
				<tbody style="color:white;background-color:DarkSlateGray">
					<tr>
						<td>SteamID / FriendID / customURL:<br>
							<input type="hidden" size="70" name="m" value="<?php echo $_GET['m']; ?>">
							<input type="text" size="70" name="s" value="<?php echo htmlentities(stripslashes(@$_GET['s']),ENT_QUOTES); ?>">
						</td>
					</tr>
					<tr>
						<td align="right">
							<input class="button" type="submit" accesskey="s" value="Submit">
						</td>
					</tr>
				</tbody>
			</table>
		</fieldset>
	</div>
</form>

<?php
$ret=get_input_type(@$_GET['s']);
if ($ret==''){

}else if (is_string($ret)){
	echo '<div><fieldset style="background-color:DarkSlateGray;color:white"><legend style="background-color:DarkSlateGray;color:white">Output</legend><table><tbody style="background-color:DarkSlateGray;color:white"><tr><td>';
	echo $ret;
	echo '</td></tr></tbody></table></fieldset>';
	if ($_GET['s']!=='') {	echo $notice; }
	echo '</div>';
}else if (is_array($ret)){
	echo '<div><fieldset style="background-color:DarkSlateGray;color:white"><legend style="background-color:DarkSlateGray;color:white">Output</legend><table><tbody style="background-color:DarkSlateGray;color:white"><tr><td>';
	convert($ret['type'],$ret['data']);
	echo '</td></tr></tbody></table></fieldset>';
	if ($_GET['s']!=='') {	echo @$notice;}
	echo '</div>';
}

function convert($type,$data){
	switch($type){
		case 'steamid':
		$main='http://steamcommunity.com/profiles/'.bcadd((($data['auth']*2)+$data['server']),'76561197960265728');
		echo 'FriendID: <a href="'.$main.'" title="Visit Steam Community page" target="blank">'.bcadd((($data['auth']*2)+$data['server']),'76561197960265728').'</a>';
		break;
		case 'friendid':
		if (substr($data,-1)%2==0) $server=0; else $server=1;
		$auth=bcsub($data,'76561197960265728');
		if (bccomp($auth,'0')!=1) {echo "Error: invalid FriendID or SteamID";return;}
		$auth=bcsub($auth,$server);
		$auth=bcdiv($auth,2);
		echo "SteamID for VALVe's GoldSrc and Source Orange Box Engine games:<br>".
			 'STEAM_0:'.$server.':'.$auth;
		echo "<br><br>SteamID for VALVe's newer games:<br>".
			 'STEAM_1:'.$server.':'.$auth;
		break;
	}
}

function get_input_type($data){
	$data=strtolower(trim($data));
	if ($data!='') {
		if (strlen($data)>80) return "too long";
		if (substr($data,0,7)=='steam_0' or substr($data,0,7)=='steam_1') {
			$tmp=explode(':',$data);
			if ((count($tmp)==3) && is_numeric($tmp[1]) && is_numeric($tmp[2])){
				return array('type'=>'steamid','data'=>array('auth'=>$tmp[2],'server'=>$tmp[1]));
			}else{
				return "Error: invalid SteamID";
			}
		}else if ($p=strrpos($data,'/')){
			$tmp=explode('/',$data);
			foreach ($tmp as $item){
				if (is_numeric($item)){
					$a=$item;
					break;
				}
			}
			if ((is_numeric($a)) && (preg_match('/7656119/', $a))) return array('type'=>'friendid','data'=>$a);
			else {
				$xml = @simplexml_load_file($data."?xml=1");
				$steamid64=$xml->steamID64;
				if (!preg_match('/7656119/', $steamid64)) return "Error: invalid link";
				else return array('type'=>'friendid','data'=>$steamid64);
			}
		}else if ((is_numeric($data)) && (preg_match('/7656119/', $data))){
			return array('type'=>'friendid','data'=>$data);
		}else{
			$xml = @simplexml_load_file("http://steamcommunity.com/id/".$data."?xml=1");
			$steamid64=$xml->steamID64;
			if (!preg_match('/7656119/', $steamid64)) return "Error: invalid input";
			else return array('type'=>'friendid','data'=>$steamid64);
		}
	}else{
		return "";
	}
}
?>