core.php

// Start User session
session_start();

if(!empty($_SESSION['uname'])) {
    $grabCurrentUser = $_SQL->query("SELECT * FROM users WHERE id = '".$_SESSION['uid']."'");
    $currentUser = $grabCurrentUser->fetch_assoc();
    $_USER['id'] = $_SESSION['uid'];
    $_USER['name'] = $_SESSION['uname'];
    $_USER['group'] = $_SESSION['group'];
    $_USER['email'] = $_SESSION['email'];
    $_USER['password'] = $_SESSION['password'];
    $_USER['img'] = $currentUser['avatar'];
    $_USER['slogan'] = $currentUser['slogan'];
    $_USER['alias'] = $currentUser['alias'];
    $_USER['theme'] = $currentUser['theme'];
    $_SESSION['theme'] = $_USER['theme'];
} if (!isset($_SESSION['theme']) OR empty($_SESSION['theme'])) {    $_SESSION['theme'] = 'g'; }
$_USER['theme'] = $_SESSION['theme'];