$result = array();
    foreach ($bestliker as $key => $value) {
        $result_count_liker_id = $key;
        $result_count_liker = $value;
        if ($result_count_liker > 0) {
            foreach ($bestcommentator as $key2 => $value2) {
                $result_count_comment_id = $key2;
                $result_count_comment = $value2;
                if ($result_count_liker_id == $result_count_comment_id ) {
                    $result= $result_count_liker + $result_count_comment;
                    var_dump($result);
                }
            }
        }
    }

$result  = array();
$input= array($bestliker,$bestcommentator);

array_walk_recursive($input, function($item, $key) use (&$final){
    $final[$key] = isset($final[$key]) ?  $item + $final[$key] : $item;
});