designtopack/public/site/plugins/notifications/user-methods/read.php

<?php

return function($notificationId) {
  try {
    $notifications = $this->notifications()->isNotEmpty() 
        ? Yaml::decode($this->notifications()->value())
        : [];            
    
    $newNotification = null;
    foreach ($notifications as $key => $notification) {
      if (!isset($notification['id'])) continue;
      if ($notification['id'] === $notificationId) {
        $notifications[$key]['isread'] = "true";
        $newNotification = $notifications[$key];
      }
    }

    $this->update([
      'notifications' => Yaml::encode(array_values($notifications))
    ]);

    return $newNotification;
  } catch (\Throwable $th) {
    throw new Exception("Error updating notifications: " . $th->getMessage() . ' line ' . $th->getLine(), 1);
  }
};