PHP array to multidimensional array

[Westscape]

I have an array in php with Objects containing an id and a parent_id. All Objects without a parent_id should be the root Objects in a new array.All Objects that do have a parent_id should be pushed in the correct Object's children array:So this is my original array:\[code\]array 0 => object(Node)[528] protected 'id' => int 1 protected 'parent_id' => null 1 => object(Node)[529] protected 'id' => int 2 protected 'parent_id' => null 2 => object(Node)[530] protected 'id' => int 3 protected 'parent_id' => 1 3 => object(Node)[531] protected 'id' => int 4 protected 'parent_id' => 1 4 => object(Node)[532] protected 'id' => int 5 protected 'parent_id' => 4 5 => object(Node)[533] protected 'id' => int 6 protected 'parent_id' => 4\[/code\]this is what the new array should look like:\[code\]$nodes = array( array( 'id' => 1, 'parent_id' => null, 'children' => array( array( 'id' => 3, 'parent_id' => 1, 'children' => null ), array( 'id' => 4, 'parent_id' => 1, 'children' => array( array( 'id' => 5, 'parent_id' => 4 ), array( 'id' => 6, 'parent_id' => 5 ), ) ), ), ), array( 'id' => 2, 'parent_id' => null, 'children' => null ), );\[/code\]Any Idea how I could do this?