Замена функции определения IP адреса на определение имени пользователя (нужна помощь с PHP кодом) - Общие вопросы по расширениям Joomla

function getClientIp() {
		global $_SERVER;
		
		if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
			$forwarded_ip_array	=	explode(',',$_SERVER['HTTP_X_FORWARDED_FOR']);
			$client_ip			=	$forwarded_ip_array[count($forwarded_ip_array) - 1];
		} else {
			$client_ip			=	$_SERVER['REMOTE_ADDR'];
		}
		return $client_ip;
	}

//check if avoid same IP or not
		$config =& JComponentHelper::getParams('com_joomlacomponent');
		$avoidsameip		=	 $config->get('avoidsameip',0);
		if ($avoidsameip) {
			$client_ip	=	$this->getClientIp();
			if ($this->isExistIP($client_ip)) {
				$mainframe->redirect( "index.php","Not allowed");
			}
		}

/**
	 *  valid URL
	 *
	 * @param string $str
	 * @return bool
	 */
	function isExistIP($str) {
		$db	=	JFactory::getDBO();
		$query = 'SELECT COUNT(*)'
			. ' FROM #__ joomlacomponent ' 
			. ' WHERE `ip`='.$db->quote($str)
			;
		$db->setQuery($query);
		$isExist	=	$db->loadResult();
		
		return ($isExist)? true : false;
	}
}

function getClientIp() {
		global $_SERVER;
		
		if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
			$forwarded_ip_array	=	explode(',',$_SERVER['HTTP_X_FORWARDED_FOR']);
			$client_ip			=	$forwarded_ip_array[count($forwarded_ip_array) - 1];
		} else {
			$client_ip			=	$_SERVER['REMOTE_ADDR'];
		}
		return $client_ip;
	}

function getClientIp() {

        $user = &JFactory::getUser($id);
        return $user->username;
    }