php check if given date time string has passed, tomorrow, today or other time

function php_check_time($time) {
  $now = new DateTime();
  $target = new DateTime($time);
  $diff = $now->diff($target);
  $diffDays = (integer)$diff->format( "%R%a" );
  switch($diffDays){
    case 0:
      return "today";
    break;
    case -1:
      return "yesterday";
    break;
    case +1:
      return "tomorrow";
    break;
    default:
      return "in $diffDays day(s)";
    break;
  }
}