php display multilevel treenode menu

Question

How do I display this structure into a multi-level menu?

Here's the structure:

array
  0 => 
    array
      'product_category_code' => string 'bracelets' (length=9)
      'product_category_desc' => string 'Bracelets' (length=9)
      'parent_node' => string '' (length=0)
      'inactive' => string '0' (length=1)
      'sort' => string '0' (length=1)
      'created_by' => string '1' (length=1)
      'created_date' => string '2014-03-14 22:04:08' (length=19)
      'modified_by' => string '1' (length=1)
      'modified_date' => string '2014-03-14 22:09:05' (length=19)
  1 => 
    array
      'product_category_code' => string 'floral-dress' (length=12)
      'product_category_desc' => string 'Floral Dress' (length=12)
      'parent_node' => string '' (length=0)
      'inactive' => string '0' (length=1)
      'sort' => string '0' (length=1)
      'created_by' => string '1' (length=1)
      'created_date' => string '2014-03-14 22:09:49' (length=19)
      'modified_by' => string '1' (length=1)
      'modified_date' => string '2014-03-30 19:06:58' (length=19)
  2 => 
    array
      'product_category_code' => string 'flowery-bracelets' (length=17)
      'product_category_desc' => string 'Flowery Bracelets' (length=17)
      'parent_node' => string 'bracelets' (length=9)
      'inactive' => string '0' (length=1)
      'sort' => string '0' (length=1)
      'created_by' => string '1' (length=1)
      'created_date' => string '2014-03-14 22:09:16' (length=19)
      'modified_by' => string '1' (length=1)
      'modified_date' => string '2014-03-30 19:08:44' (length=19)
  3 => 
    array
      'product_category_code' => string 'small-flowery-bracelets' (length=23)
      'product_category_desc' => string 'Small Flowery Bracelets' (length=23)
      'parent_node' => string 'flowery-bracelets' (length=17)
      'inactive' => string '0' (length=1)
      'sort' => string '0' (length=1)
      'created_by' => string '1' (length=1)
      'created_date' => string '2014-03-14 22:08:35' (length=19)
      'modified_by' => string '1' (length=1)
      'modified_date' => string '2014-03-30 19:09:44' (length=19)
  4 => 
    array
      'product_category_code' => string 'summer-dress' (length=12)
      'product_category_desc' => string 'Summer Dress' (length=12)
      'parent_node' => string '' (length=0)
      'inactive' => string '0' (length=1)
      'sort' => string '0' (length=1)
      'created_by' => string '1' (length=1)
      'created_date' => string '2014-03-14 22:09:29' (length=19)
      'modified_by' => string '0' (length=1)
      'modified_date' => null

And output should be like this:

• Bracelets
  • Flowery Bracelets
    • Small Flowery Bracelets
• Floral Dress
• Summer Dress

Here is what I did but it still display the child nodes a

function getChildren($rows, $p = 0) {
$r = array();
foreach($rows as $row) {
    if ($row['parent_node']==$p) {
        var_dump($p);
        $r[$row['product_category_code']] = getChildren($rows, $row['product_category_code']);
    }
}
return $r;

Thanks!

Answer 1

It's because you still have the categories in the array when you already assigned them. What you can do is to do the function where you pass the argument as a reference, and the in the foreach loop to have the ability to clear the array from that already assigned category. Simple implementation below.

function getChildren(&$rows, $p = 0) {
    $r = array();
    foreach($rows as $row_id => $row) {
        if ($row['parent_node']==$p) {
            $r[$row['product_category_code']] = getChildren($rows, $row['product_category_code']);
            unset($rows[$row_id]);
        }
    }
    return $r;
}