php array recursion

Question

I have an array like this:

Array ( 
[0] => Array ( [id] => 1000 [enroller_id] => 1005) 

[1] => Array ( [id] => 1005 [enroller_id] =>) 

[2] => Array ( [id] => 1101 [enroller_id] => 1000 ) 

[3] => Array ( [id] => 1111 [enroller_id] => 1000 ) 
)

I want to create hierarchy array like this:

Array(
[1005] => Array(
               [1000] => Array(
                              [1101] => ...
                              [1111] => ...
                              )
               )
)

Can you help me? I think that it is a recursion.

Answer 1

This will do what you want, except it does not put the first element (1005) in the array:

function create_array($number, $data)
{
    $result = array();
    foreach ($data as $row)
    {
        if ($row['enroller_id'] == $number)
        {
            $result[$row['id']] = create_array($row['id'], $data);
        }
    }
    return $result;
}

print_r(create_array(1005, $data));

Output:

Array
(
    [1000] => Array
        (
            [1101] => Array ()
            [1111] => Array ()
        )
)