Method $_GET

<?php
$id = @$_GET['id'];
include"modul/menu_kiri.php";
$jurusan = $_SESSION['jurusan'];



if($id =='1'){
?>
        <div class="col-sm-9 col-sm-offset-3 col-md-10 col-md-offset-2 main">
            <h1 class="page-header"><span class="glyphicon glyphicon-book"></span> &nbsp Latihan</h1>

        </div>
<?php
}elseif($id =='2'){
?>

<div class="col-sm-9 col-sm-offset-3 col-md-10 col-md-offset-2 main">
<h1 class="page-header"><span class="glyphicon glyphicon-book"></span> &nbsp Mata Pelajaran</h1>

          <div class="row ">
            <ul class="nav nav-sidebar ">
            <?php
                $sql    ="SELECT DISTINCT `mapel` ,`jurusan` FROM  `tbl_soal`  WHERE `jurusan` = '$jurusan' ";
                $query  = mysql_query($sql);
                while($row = mysql_fetch_array($query))
                {
            ?>
            <li><a href="index_user.php?halaman=peraturan&mapel=<?php echo $row['mapel'];?>"><span class="glyphicon glyphicon-book"></span> &nbsp <?php echo $row['mapel'];?></a></li>
            <?php
                }
            ?>
            </ul>
          </div>
</div>
<?php
    }
?>