public static function getEnv()
    {   
        if (null !== (getenv('P_DRIVER'))) {

            $dotEnv = new Dotenv($_SERVER['DOCUMENT_ROOT']);
            $dotEnv->load();
        }    
      
        self::$driver  = getenv('P_DRIVER');
        self::$host    = getenv('P_HOST');
        self::$dbname  = getenv('P_DBNAME');
        self::$user    = getenv('P_USER');
        self::$pass    = getenv('P_PASS');  
    }