Ben bu dizi var:

array
  0 => string '3,6' (length=3)
  3 => string '4,5' (length=3)
  4 => string '7,8' (length=3)
  8 => string '9' (length=1)

VEYA

array
  3 => 
    array
      4 => 
        array
          7 => null
          8 => 
            array
              9 => null
      5 => null
  6 => null

Every key is the id and value is the id for the childs of this parent.
ID of 0 means that (3 & 6) have no parent.
Now, i want to output an HTML list like:

• 3
  • 4
    • 7
    • 8
      • 9
  • 5
• 6