PHP - 如何将网站翻译成多种语言?

I have a website that's currently in English; I want to be able to switch to a different language when a user clicks on a different language (there are little country flag icons on the site). The way I'm currently trying is with arrays, e.g.:

$english = array('index',
           array('h1' => 'this is some h1 text', 
                 'h2' => 'this is some h2 text'));

$japanese = array('index',
            array('h1' => '世界交換への歓迎',
                  'h2' => 世界交換への'));


print $english[index][h1];
print $japanese[index][h2];

如您所见，如果我以单独的语言为每个页面都这样做，那将是大量的代码.我还可以尝试什么其他方法?