邻接列表排序算法

I have this kind of adjacency list:

I need to sort it to this: 2, 7, 9, 10, 8, 16, 17, 11

Basiccaly I have table where I have stored posts with parent ids. I can have unlimited number of levels.

I need just algorithm or full code in PHP.

I tried to use variations of row/column prefixes and some recurrent functions.

Okay, i finally did it. I was idi*t.

public function makeTree($parent_id = 0, &$array = array())
{
   // Get results where parent_id == $parent_id
  $recepts = $this->recept->get()->where("parent_id =" . $parent_id);
   // Foreach through them
   foreach ($recepts as $recept) {
     // Add this to array
     array_push($array, $recept);
     // Repeat
     $this->makeTree($recept["id"], $array);
   }
   return $array;
}