Language klasse?

<?php
class Language {
	private $languages = array('en');
	private $lang;
	private $langArray;
	public function __construct() {
		$this->$lang = $_COOKIE['language'];
		if(!isset($_COOKIE['language']) || !in_array($this->lang,$this->languages)) {
				$lang = STANDARD_LANGUAGE;	
		}
		define('LANG',$lang);
		$this->getLangContents();
	}
	
	public function change_lang($new) {
		if(isset($_COOKIE['language']) && !in_array($this->lang,$this->languages)) {
			$_COOKIE['language'] = $new;
			return;
		}
			setcookie('language',$new,time()+(3600*24*365),'/','gamesig.net');
	}
	public static function get_languages() {
		return $this->languages;	
	}
	
	private function getLangContents() {
		global $langArray;
		include_once($_SERVER['DOCUMENT_ROOT'].'/lang/'.$this->lang.'.php');
		$this->langArray = $langArray;
	}
	
	public function g($id, $replaceArray = null) {
		$text = $this->langArray[$id];
		if($replace != null && is_array($replaceArray)) {
			foreach($replaceArray as $search => $replace) {
				str_replace('{'.$search.'}',$replace,$text);
			}
		}
		return $text;
	}
	
}