Ouzo\Utilities\Arrays::getNestedValue PHP Метод

    public static function getNestedValue(array $array, array $keys)
    {
        foreach ($keys as $key) {
            $array = self::getValue(self::toArray($array), $key);
            if (!$array) {
                return $array;
            }
        }
        return $array;
    }

 public function get($keys)
 {
     if (!isset($_SESSION)) {
         return null;
     }
     return Arrays::getNestedValue($_SESSION, $keys);
 }