Arkadaşlar index.php ana kategori isimleri yer alıyor linke tıklayınca alt kategori sayfası açılıyor. bende şöyle yapmak istiyorum ana sayfada Ana kategorinin altında sıralasın istiyorum birleştirmeme yardımcı olursanız sevinirim

Audi
A1
A3
A4
A5
vs..
BMW
3.16
3.18
3.20
vs..
Aşağıdaki kod index.php
<?php
include "./appy/connectPDO.php";
    $title = 'Free';

    $sql = $db->prepare("SELECT id, ad FROM bolumListesi");
    $sql->execute();

    $liste = $sql->fetchAll(PDO::FETCH_ASSOC);

    $myFavorites = $db->prepare("SELECT * FROM favorites WHERE ip = :ip");
    $myFavorites->execute(["ip" => $_SERVER['REMOTE_ADDR']]);
    $myFavorites = $myFavorites->fetchAll(PDO::FETCH_ASSOC);

    $ids = [];
    foreach($myFavorites as $item){
      array_push($ids, $item['lesson_id']);
    }
    $ba = "(";
    $idss = join(',',$ids);
    $ba .= $idss. ')';



    $sor = 'SELECT * FROM bolumListesi WHERE id IN '.$ba;
    $lessons = $db->prepare($sor);
    $lessons->execute();
    $lessons = $lessons->fetchAll(PDO::FETCH_ASSOC);

   
    
?>
<?php include 'header.php'; ?>

      <ul style="list-style:none;">
      <?php foreach ($liste as $key => $item) {?>
        <li style="width:100%;" class="list-group-item list-group-item-action list-group-item-primary rounded"><div><a href="<?php echo 'http://site.com.tr/donem-sec.php?bolumId='.$item['id'] ?>" class="" style="margin-top: -1px; margin-bottom: -1px; color:black; text-decoration:none; width:100%;  display:block;"><?php echo $item['ad']; ?> </a>
      
        </div>
        </li>
      <?php } ?>
      </ul>
      <?php if(count($liste) < 1) { ?>
        <div class="alert alert-warning">
          <strong>Hata!</strong> Ders bulunamadı.
        </div>
      <?php } ?>
    

<?php include 'footer.php'; ?>
Buradaki de altkategori.php

<?php

include "./appy/connectPDO.php";



    $title = '<a href="site.com" style="color: white; font-size: 20px;"><i class="glyphicon glyphicon-home"></i></a>';

    $backUrl = '/';



    $bolumId = $_GET['bolumId'];

    

    $sql = $db->prepare("SELECT id, ad FROM bolumListesi WHERE id = :id");

    $sql->execute(['id' => $bolumId]);



    $title = $sql->fetch(PDO::FETCH_ASSOC)['ad'];



    $sql = $db->prepare("SELECT id, ad FROM dersListesi WHERE bolum_id = ?");

    $sql->execute(array($bolumId));



    $liste = $sql->fetchAll(PDO::FETCH_ASSOC);

    



?>

<?php include 'header.php'; ?>

<br>

    <div class="list-group">

    <ul style="list-style:none;">
      <?php foreach ($liste as $key => $item) {?>
        <li style="width:100%;" class="list-group-item list-group-item-action list-group-item-primary rounded"><div><a href="<?php echo 'http://site.com.tr/test-sec.php?donemId='.$item['id'].'&bolumId='.$bolumId ?>" class="" style="margin-top: -1px; margin-bottom: -1px; color:black; text-decoration:none; width:100%;  display:block;"><?php echo $item['ad']; ?> </a>
         <?php if(!in_array($item['id'],$ids)){ ?> <a href="ajax.php?addFavorite=1&lesson_id=<?=$item['id']?>&ref_url=<?=$bolumId?>" style="float:right; border:1px solid #ddd; border-radius:5px; padding:3px; color:white; background-color:#00008B; text-decoration:none; margin-top:-20px; z-index:999;">Favoriye Ekle</a> 
          <?}else{ ?>
            <a href="ajax.php?removeFavorite=1&lesson_id=<?=$item['id']?>&ref_url=<?=$bolumId?>" style="float:right; border:1px solid #ddd; border-radius:5px; padding:3px; color:white; background-color:darkred; text-decoration:none; margin-top:-20px; z-index:999;">Favoriden Kaldır</a>  
          <?php } ?>
        </div>
        </li>
      <?php } ?>
      </ul>

     

    </div>



    <?php if(count($liste) < 1) { ?>

        <div class="alert alert-warning">

          <strong>Hata!</strong> Bu derse ait test bulunamadı.

        </div>

      <?php } ?>



<?php include 'footer.php'; ?>