switch ($n) {
    case $value1:
        $result = $return_value1;
        break;
    case $value2:
        $result = $return_value2;
        break;
    default:
        $result = $default_value;
        break;
}

$result = match ($n) {
    $value1, $value2 => $a, // if ($n === $value1 || $n === $value2) $result = a;
    $value2 => $return_value2, // elseif ($n === $value2) $result = $return_value2;
    default => $default_value // else $result = $default_value;
};