Question

below is my SQL table

id   parent_id

1      0
2      0
3      1
4      1
5      3
6      5

i want to display n’th level hierarchic relation in array like below

array
{
  1
    sub{
         3
           sub{
               5
           }
         4
        }
 }

and so on

how can i do this in PHP

Answer 1

first select all your root categories with parent id 0 and pass their ids to this recursive function

function getChildCats($catId)
{
    $sql = "select * from categories where parent_id = $cateID";
    $res = mysql_query($sql);
    $raws[];  
    while($raw = mysql_fetch_assoc($res))
    {
        $raw['sub'] =  getChildCats($raw['id'])
        $raws[] = $raw;
    }
    return $raws;
}