get all keys that match value from multidimensional array

[dodgeitorelse3]

I have an array like this:

Array
(
    [0] => Array
        (
            [id] => 1
            [oname] => Border.aao
            [osize] => 11441673
        )

    [1] => Array
        (
            [id] => 2
            [oname] => Border.aao
            [osize] => 8194731
        )

    [2] => Array
        (
            [id] => 3
            [oname] => Border.aao
            [osize] => 8104714
        )

    [3] => Array
        (
            [id] => 4
            [oname] => BRM_Range.aao
            [osize] => 6848551
        )

    [4] => Array
        (
            [id] => 5
            [oname] => camp_mackall.aao
            [osize] => 17524696
        )

    [5] => Array
        (
            [id] => 6
            [oname] => Canyon.aao
            [osize] => 13310448
        )

    [6] => Array
        (
            [id] => 7
            [oname] => District.aao
            [osize] => 21848613
        )
)

I tried to get all keys that match a search value such as Border.aao

$mykey = array_search("Border.aao", array_column($duplicate_mapname_array_snames, 'oname'));

but this only gives me the first key. I want to get all the keys which should be 0,1 and 2

 

How do I achieve this?

[Barand]

Use array keys instead of array_search

$results = array_keys(array_column($data, 'oname'), 'Border.aao');

 

[dodgeitorelse3]

Thank you Barand