Question

I have an array like this

Array
(
    [0] => Array
        (
            [0] => 83
            [1] => 82
            [2] => 81
        )

    [1] => Array
        (
            [0] => 81
            [1] => 82
            [2] => 83
            [3] => 100
            [4] => 101
            [5] => 102
            [6] => 103
            [7] => 104
            [8] => 105
        )

)

and I want to delete any values from the first array that are not equal to this array

Array
(
    [0] => 83
    [1] => 82
    [2] => 81
)

But i want to keep the same structure as the first array. So i would end up with something like this

Array
(
    [0] => Array
        (
            [0] => 83
            [1] => 82
            [2] => 81
        )

    [1] => Array
        (
            [0] => 81
            [1] => 82
            [2] => 83
        )

)

What is the best way to achieve this?

Answer 1

if $array is your starting array and $matches is the array of values you want to match;

foreach ($array as $key => $subarray) {
    foreach ($subarray as $subsubarray) {
        foreach ($matches as $match) {
            if ($subsubarray == $match) {
                $finalarr[$key][] = $subsubarray;
            }
        }
    }
}

$finalarr will be your desired result.