how to convert this Associative array into another form in PHP?

hey I’m using PHP and I have this array called $memdeps

            [0] => Array
                (
                    [rel_id] => 2
                    [dep_id] => 4
                    [member_id] => 8
                )

            [1] => Array
                (
                    [rel_id] => 3
                    [dep_id] => 1
                    [member_id] => 8
                )

            [2] => Array
                (
                    [rel_id] => 4
                    [dep_id] => 3
                    [member_id] => 8
                )

            [3] => Array
                (
                    [rel_id] => 9
                    [dep_id] => 3
                    [member_id] => 9
                )

            [4] => Array
                (
                    [rel_id] => 8
                    [dep_id] => 1
                    [member_id] => 9
                )

        )

and I want to convert it to a form where the dep_id key contains all the related member_id’s

the wanted result is like that form

[dep_id] => Array
                (
                    [0] => member_id 1
                    [1] => member_id 2
                    [2] => member_id 3
                )

and the actually wanted result is like that

[0] => Array
         (
            [3] => Array
                (
                    [0] => 8
                    [1] => 9
                )
            [4] => Array
                (
                    [0] => 8
                )
           [1] => Array
                (
                    [0] => 8
                    [1] => 9
                )
       )

I tried that code

$memdep = array();
foreach($memdeps as $key => $value){
    $memdep[] = $memdep[][$value->dep_id] = $value->member_id;
}

and it’s not working , and I don’t know how to be able to do it

Answer

Here is the solution

$memdep = array();

foreach($memdeps as $key => $value)

{

$memdep[$value->dep_id][] = $value->member_id;

}