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<?php
session_start();

function sanitize($data) {
    return htmlspecialchars(strip_tags(trim($data)));
}

function generate_csrf_token() {
    if (empty($_SESSION['csrf_token'])) {
        $_SESSION['csrf_token'] = bin2hex(random_bytes(32));
    }
    return $_SESSION['csrf_token'];
}

function verify_csrf_token($token) {
    if (isset($_SESSION['csrf_token']) && hash_equals($_SESSION['csrf_token'], $token)) {
        return true;
    }
    return false;
}

function redirect($url) {
    header("Location: $url");
    exit();
}

function is_logged_in() {
    return isset($_SESSION['admin_id']);
}

function is_customer_logged_in() {
    return isset($_SESSION['customer_id']);
}

function get_setting($key, $default = '') {
    global $pdo;
    if (!isset($pdo)) return $default;
    try {
        $stmt = $pdo->prepare("SELECT setting_value FROM website_settings WHERE setting_key = ? LIMIT 1");
        $stmt->execute([$key]);
        $val = $stmt->fetchColumn();
        return $val !== false ? $val : $default;
    } catch (\PDOException $e) {
        return $default;
    }
}
?>

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