code: private static function save(array $utmCookieSave)
  	{
  		$expire = new DateTime();
  		$expire->add(self::$lifetime);
  		
  		foreach ($utmCookieSave as $key => $value) {
  			setcookie(self::$utmCookieName . '[' . $key . ']', $value, $expire->getTimestamp(), self::$path, self::$domain, self::$secure, self::$httpOnly);
  		}
  
  		self::$utmCookie = $utmCookieSave;
  	}
docs: Save utmCookie value into _COOKIE and set actual self::$utmCookie value (call only from init).
  
  @param array $utmCookieSave