index.php

<?php
    if (!isset($_SESSION)) {
        session_start();
    }

    // Signed In User check
    if (!isset($_SESSION['st']['userId'])) {
        header('Location: sign-in.php');
        exit;
    }

    // Include Settings
    include 'includes/config.php';

    // Include Functions
    include 'includes/functions.php';

    // Include Sessions & Localizations
    include 'includes/sessions.php';

    // Account Sign Out
    if (isset($_GET['action']) && $_GET['action'] == 'signout') {
        session_destroy();
        header('Location: sign-in.php');
    }

    // Link to the Page
    if (isset($_GET['page']) && $_GET['page'] == 'newTask') {
        $page = 'newTask';
    } elseif (isset($_GET['page']) && $_GET['page'] == 'viewTask') {
        $page = 'viewTask';
    } elseif (isset($_GET['page']) && $_GET['page'] == 'notes') {
        $page = 'notes';
    } elseif (isset($_GET['page']) && $_GET['page'] == 'newNote') {
        $page = 'newNote';
    } elseif (isset($_GET['page']) && $_GET['page'] == 'viewNote') {
        $page = 'viewNote';
    } elseif (isset($_GET['page']) && $_GET['page'] == 'profile') {
        $page = 'profile';
    } else {
        $page = 'dashboard';
    }

    if (file_exists('pages/'.$page.'.php')) {
        // Load the Page
        include 'pages/'.$page.'.php';
    } else {
        echo '<h3>Error &mdash; Page Not Found.</h3>';
    }

    include 'includes/footer.php';