pfSense

function array_combine($arr1, $arr2) {

    $out = array();

    $arr1 = array_values($arr1);

    $arr2 = array_values($arr2);

    foreach($arr1 as $key1 => $value1) {

        $out[(string)$value1] = $arr2[$key1];

    }

    return $out;

}