日期/字符串比较

Question

i need to compare two dates one of which is actually a string. So i get today's date from date('d/m/y') and the other date from somewhere in my db. This one is a string looking like 'dd/mm/yyyy'.

I don't know how to compare them, i've tried over and over again but i can't get it working. here's the code

<?
  require_once '/web/ticket/src/event/Event.php';
  require_once '/web/ticket/src/ticket/Ticket.php';

  $tickets = Ticket::getTickets();
  $events = Event::getEvents();

  $today = date('d/m/Y');

  foreach($events as $k => $event) {
    $data_1 = $event['data_singolo'];
    $data_2 = $event['data_a'];

    if($today>$data_1 || $today>$data_2) {
       Event::setInvalid($event['_id']);
    } else {
      echo "evento attivo<br><br>";
    }
  }

  foreach($tickets as $k => $ticket) {
    $event = Event::getEventById($ticket['event_id']);
    if($event['valid']==0) {
      Ticket::setInvalid($ticket['_id']);
    }
  }
?>

PS. 'Data' means 'date';

Answer 1

Using the DateTime class is a way to do it if you need special non-standard date formats. :)

<?
  require_once '/web/ticket/src/event/Event.php';
  require_once '/web/ticket/src/ticket/Ticket.php';

  $tickets = Ticket::getTickets();
  $events = Event::getEvents();

  $today = new DateTime("today");

  foreach($events as $k => $event) {
    $data_1 = DateTime::createFromFormat("d/m/Y", $event['data_singolo']);
    $data_2 = DateTime::createFromFormat("d/m/Y", $event['data_a']);

    if($today>$data_1 || $today>$data_2) {
       Event::setInvalid($event['_id']);
    } else {
      echo "evento attivo<br><br>";
    }
  }

  foreach($tickets as $k => $ticket) {
    $event = Event::getEventById($ticket['event_id']);
    if($event['valid']==0) {
      Ticket::setInvalid($ticket['_id']);
    }
  }
?>