Авторизация через steam

<?php
 
    include "apikey.php";
    include "OpenId.php";
 
    $OpenID = new LightOpenID("localhost");
 
    session_start();
 
    if(!$OpenID->mode){
 
        if(isset($_GET['login'])){
            $OpenID->identity = "http://steamcommunity.com/openid";
            header("Location: {$OpenID->authUrl()}");
        }
 
        if(!isset($_SESSION['T2SteamAuth'])){
            $login = "<div id=\"login\">Welcome Guest. Please <a href=\"?login\"><img src=\"http://cdn.steamcommunity.com/public/images/signinthroughsteam/sits_small.png\"/></a> to *Website Action*.</div>";
        }
 
    } elseif($OpenID->mode == "cancel"){
        echo "User has canceled Authenticiation.";
    } else {
 
        if(!isset($_SESSION['T2SteamAuth'])){
 
            $_SESSION['T2SteamAuth'] = $OpenID->validate() ? $OpenID->identity : null;
            $_SESSION['T2SteamID64'] = str_replace("http://steamcommunity.com/openid/id/", "", $_SESSION['T2SteamAuth']);
 
            if($_SESSION['T2SteamAuth'] !== null){
 
                $Steam64 = str_replace("http://steamcommunity.com/openid/id/", "", $_SESSION['T2SteamAuth']);
                $profile = file_get_contents("http://api.steampowered.com/ISteamUser/GetPlayerSummaries/v0002/?key={$api}&steamids={$Steam64}");
                $buffer = fopen("cache/{$Steam64}.json", "w+");
                fwrite($buffer, $profile);
                fclose($buffer);
 
            }
 
            header("Location: index.php");
 
        }
 
    }
 
    if(isset($_SESSION['T2SteamAuth'])){
 
        $login  = "<div id=\"login\"><a href=\"?logout\">Logout</a></div>";
 
    }
 
    if(isset($_GET['logout'])){
 
        unset($_SESSION['T2SteamAuth']);
        unset($_SESSION['T2SteamID64']);
        header("Location: index.php");
 
    }
 
    $steam = json_decode(file_get_contents("cache/{$_SESSION['T2SteamID64']}.json"));
 
 
    echo $login;
 
    echo "<img src=\"{$steam->response->players[0]->avatarfull}\"/>";