PHP動態多維數組或對象

Question

我試圖創建一個遞歸函數（或方法），它將一個子層導航存儲在一個數組變量或對象中。這裏是我有：

 
class Navigation extends Database 
{ 

    function build($parent_id = 0) 
    { 
     $query = 'SELECT id, name, href, parent_id 
     FROM navigation 
     WHERE parent_id = '.$parent_id.' 
     ORDER BY name'; 
     $results = $db->query($query); 
     while ($row = $results->fetch_object()) { 
      $nav[$row->id] = $row; 
      // echo $row; 
      $this->build($row->id); 
     } 
     return $nav; 
    } 
} 

如果你註釋掉echo $row一切工作正常。因此，我希望它在一個三層的導航做的是：

 
Array 
(
    [1] => stdClass Object 
    (
     [id] => 1 
     [name] => Home 
     [href] => home.php 
     [parent_id] => 0 
    ) 
    [2] => stdClass Object 
    (
     [id] => 2 
     [name] => Company 
     [href] => company.php 
     [parent_id] => 0 
    ) 
     [4] => stdClass Object 
     (
      [id] => 4 
      [name] => Company Vision 
      [href] => company_vision.php 
      [parent_id] => 2 
     ) 
     [5] => stdClass Object 
     (
      [id] => 5 
      [name] => Company Goals 
      [href] => company_goals.php 
      [parent_id] => 2 
     ) 
    [3] => stdClass Object 
    (
     [id] => 3 
     [name] => Products 
     [href] => products.php 
     [parent_id] => 0 
    ) 
     [6] => stdClass Object 
     (
      [id] => 6 
      [name] => Products Shoes 
      [href] => products_shoes.php 
      [parent_id] => 3 
     ) 
      [7] => stdClass Object 
      (
       [id] => 7 
       [name] => Nike 
       [href] => products_shoes_nike.php 
       [parent_id] => 6 
      ) 

) 

只是作爲一個例子，所以該數組將動態做到這一點：

 
$nav[$row->id] = $row; // Home 
$nav[$row->id] = $row; // Company 
$nav[2][$row->id] = $row; // Company Vision 
$nav[2][$row->id] = $row; // Company Goals 
$nav[$row->id] = $row; // Products 
$nav[3][$row->id] = $row; // Products Shoes 
$nav[3][6][$row->id] = $row; // Products Shoes Nike 

在此先感謝。

問題：如何製作遞歸函數/方法並將遞歸信息存儲在變量中而不是回顯結果？

問題： （一）PHP覆蓋變量每次遞歸調用自己 （b）一個解決辦法是動態動態創建一個數組的時間，但我不知道這是可能的

Answer 1

我懷疑你需要嵌套設置算法http://mikehillyer.com/articles/managing-hierarchical-data-in-mysql/