PHP动态多维数组或对象

Question

我试图创建一个递归函数（或方法），它将一个子层导航存储在一个数组变量或对象中。这里是我有：

 
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; 
    } 
} 

如果你注释掉echo $row一切工作正常。因此，我希望它在一个三层的导航做的是：

 
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 
      ) 

) 

只是作为一个例子，所以该数组将动态做到这一点：

 
$nav[$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 

在此先感谢。

问题：如何制作递归函数/方法并将递归信息存储在变量中而不是回显结果？

问题： （一）PHP覆盖变量每次递归调用自己 （b）一个解决办法是动态动态创建一个数组的时间，但我不知道这是可能的

Answer 1

我怀疑你需要嵌套设置算法http://mikehillyer.com/articles/managing-hierarchical-data-in-mysql/