getMyData funktion

function getMyData($type)
{

    if (isset($_SESSION["dataFetched"]) && $_SESSION["dataFetched"] == "true") {
        $rs = $_SESSION[$type];
    }
    else {
        $returnData_sql = mysql_query("SELECT * FROM users WHERE id='$_SESSION[user_id]'");
        $returnData = mysql_fetch_array($returnData_sql);

            $_SESSION["dataFetched"] == "true";
            $_SESSION["email"] == $returnData["email"];
            $_SESSION["firstname"] == $returnData["firstname"];
            $_SESSION["lastname"] == $returnData["lastname"];
            $_SESSION["adress"] == $returnData["adress"];
            $_SESSION["zip"] == $returnData["zip"];
            $_SESSION["city"] == $returnData["city"];
            $_SESSION["country"] == $returnData["country"];

        $rs = $_SESSION[$type];
    }

    return $rs;
}