mivo/app/Helpers/FlashHelper.php

<?php

namespace App\Helpers;

class FlashHelper {
    const SESSION_KEY = 'flash_notification';

    /**
     * Set a flash message.
     *
     * @param string $type           Notification type: 'success', 'error', 'warning', 'info', 'question'
     * @param string $title          Title of the notification (or i18n key)
     * @param string $message        (Optional) Body text of the notification (or i18n key)
     * @param array  $params         (Optional) Parameters for translation interpolation
     * @param bool   $isTranslated   Whether to treat title and message as translation keys
     */
    public static function set($type, $title, $message = null, $params = [], $isTranslated = false) {
        if (session_status() === PHP_SESSION_NONE) {
            session_start();
        }
        
        $_SESSION[self::SESSION_KEY] = [
            'type'          => $type,
            'title'         => $title,
            'message'       => $message,
            'params'        => $params,
            'isTranslated'  => $isTranslated
        ];
    }

    /**
     * Check if a flash message exists.
     *
     * @return boolean
     */
    public static function has() {
        if (session_status() === PHP_SESSION_NONE) {
            session_start();
        }
        return isset($_SESSION[self::SESSION_KEY]);
    }

    /**
     * Get the flash message and clear it from session.
     *
     * @return array|null
     */
    public static function get() {
        if (session_status() === PHP_SESSION_NONE) {
            session_start();
        }

        if (self::has()) {
            $notification = $_SESSION[self::SESSION_KEY];
            unset($_SESSION[self::SESSION_KEY]);
            return $notification;
        }

        return null;
    }
}