core/Session.php

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<?php
require_once __DIR__ . '/../config/database.php';

class Session {
    public static function start() {
        if (session_status() === PHP_SESSION_NONE) {
            session_name(SESSION_NAME);
            session_start();
        }
    }
    
    public static function set($key, $value) {
        $_SESSION[$key] = $value;
    }
    
    public static function get($key, $default = null) {
        return $_SESSION[$key] ?? $default;
    }
    
    public static function has($key) {
        return isset($_SESSION[$key]);
    }
    
    public static function remove($key) {
        unset($_SESSION[$key]);
    }
    
    public static function destroy() {
        $_SESSION = [];
        if (ini_get("session.use_cookies")) {
            $params = session_get_cookie_params();
            setcookie(session_name(), '', time() - 42000,
                $params["path"], $params["domain"],
                $params["secure"], $params["httponly"]
            );
        }
        session_destroy();
    }
    
    public static function regenerate() {
        session_regenerate_id(true);
    }
    
    public static function setFlash($type, $message) {
        $_SESSION['flash'][$type] = $message;
    }
    
    public static function getFlash($type) {
        $message = $_SESSION['flash'][$type] ?? null;
        unset($_SESSION['flash'][$type]);
        return $message;
    }
    
    public static function hasFlash($type) {
        return isset($_SESSION['flash'][$type]);
    }
    
    public static function isLoggedIn() {
        return self::has('user_id') && self::has('user_role');
    }