[MySQL][PHP] Menu wielopoziomowe Opcje

[marek71_33]

Chcę utworzyć memu wielopoziomowe. Mam tabelę

[SQL] pobierz, plaintext 
page_id | page_parent | page_subject
9 | NULL | Kategoria 1
10 | 9 | Podkategoria 1.1
11| 9 | Podkategoria 1.2
12| 10 | Podkategoria 1.1.1
13| 10 | Podkategoria 1.1.2
14| 12 | Podkategoria 1.1.1.1
16| NULL | Kategoria 2
18 | NULL | Kategoria 3
[SQL] pobierz, plaintext 

Chciałbym uzyskać takie coś:

[HTML] pobierz, plaintext 
Kategoria 1
   Podkategoria 1.1
        Podkategoria 1.1.1
            Podkategoria 1.1.1.1
        Podkategoria 1.1.2
    Podkategoria 1.2
Kategoria 2
Kategoria 3
[HTML] pobierz, plaintext 

Natomiast otrzymuję takie coś:

[HTML] pobierz, plaintext 
Kategoria 1
   Podkategoria 1.1
        Podkategoria 1.1.1
            Podkategoria 1.1.1.1
        Podkategoria 1.1.2
    Podkategoria 1.2
[HTML] pobierz, plaintext 

Mój kod:

[PHP] pobierz, plaintext 
$pdo = new PDO("mysql:dbname=07117910_sp5;host=localhost","root","");
 
$query = $pdo->query("SELECT * FROM page_v ORDER BY page_order, page_matrix");
 
$family_tree = [];
$root_parent = -1;
$root_parent_name = "";
 
function makeTree($query,&$family_tree,&$root_parent,&$root_parent_name){
   while($row = $query->fetch(PDO::FETCH_ASSOC)){
      if(is_null($row['page_parent'])){
          $root_parent = $row['page_id'];
          $root_parent_name = $row['page_subject'];
      }else{
          if(!isset($family_tree[$row['page_parent']])){
            $family_tree[$row['page_parent']] = [];
          }          
          $family_tree[$row['page_parent']][] = array($row['page_subject'],$row['page_id']);
      }    
   }
}
 
function buildList($family_tree,$parent){
  $list = "<ul>";
 
  foreach($family_tree[$parent] as $each_child){
     $list .= "<li>" . $each_child[0];
     if(isset($family_tree[$each_child[1]])){
        $list .= buildList($family_tree,$each_child[1]);
     }
     $list .= "</li>";
  }
 
  $list .= "</ul>";
 
  return $list;
 
}
makeTree($query,$family_tree,$root_parent,$root_parent_name);
 
 
echo "<ul>";
echo "<li>$root_parent_name";
echo buildList($family_tree,$root_parent);
echo "</li>";
echo "</ul>";
[PHP] pobierz, plaintext 

Co jest nie tak z tym kodem?