<? 

if(!isset($_GET['s']) || empty($_GET['s']) || $_GET['s'] == '')  
    $s = '1';  
else  
    $s = $_GET['s'];  
      
if(!isset($_GET['lang']) || empty($_GET['lang']) || $_GET['lang'] == '')  
    $dil = 'tr';  
else  
    $dil = $_GET['lang'];  

?> 

<?php 
    switch($s){     
        case "1"; 
            include("$dil/1.php"); 
        break; 
        case "2"; 
            include("$dil/2.php"); 
        break; 
    } 
     
?>