php做项目进行中英文的切换，如何快速实现

<div class="top">      <div class="contenters">        <a href="<?php echo APP::URL($page,array('language'=>'cn')); ?>">中文</a>        <a href="<?php echo APP::URL($page,array('language'=>'en')); ?>">English</a>      </div></div>

$page = 'newexhibitors';if(isset($_GET['language'])){   if($_GET['language']=='cn'){       $_SESSION['lan'] = 'cn';       $title = '测试';       require APP::TPL('newexhibitors');   }else if($_GET['language']=='en'){       $_SESSION['lan'] = 'en';       $title = 'Test';       require APP::TPL('en_newexhibitors');   }}else{    if($_SESSION['lan']){       if($_SESSION['lan']=='cn'){            $title = '测试';            require APP::TPL('newexhibitors');       }else{            $title = 'Test';            require APP::TPL('en_newexhibitors');       }    }else{       $_SESSION['lan']='cn';       $title = '测试';       require APP::TPL('newexhibitors');    }}