I have a such array:
$tree= array(
0=>array('id'=>1, 'parent'=>0),
1=>array('id'=>2, 'parent'=>0),
2=>array('id'=>3, 'parent'=>2),
3=>array('id'=>4, 'parent'=>3),
4=>array('id'=>5, 'parent'=>2),
5=>array('id'=>6, 'parent'=>0),
6=>array('id'=>7, 'parent'=>3),
7=>array('id'=>8, 'parent'=>4),
8=>array('id'=>9, 'parent'=>1),
9=>array('id'=>10, 'parent'=>0),
10=>array('id'=>11, 'parent'=>10),
);
and need to get this output:
-1
--9
-2
--3
---4
----8
--5
--7
-6
-10
--11
But I'm very bad in recursion, please help !