Search code examples
phpgetfilter-input

Why is filter_input returning NULL when the variables exist?

I'm trying to retrieve some GET data and filter it to make sure it contains an integer. The url string is events.php?id=22&month=2, but when I try to get either variable filter_input returns NULL for some reason, I can't figure out why. This is my code:

if(!isset($pageId)) {
    $pageId = filter_input(INPUT_GET, 'id', FITER_VALIDATE_INT) ?: 4;
}
if(!isset($month)) {
    $month = filter_input(INPUT_GET, 'month', FITER_VALIDATE_INT) ?: date('n');
    var_dump($_SERVER['QUERY_STRING'], filter_input(INPUT_GET, 'month', FITER_VALIDATE_INT));
}

The var_dump returns string(13) "id=22&month=2" NULL. I've also tried var_dump($_GET) and get back array(2) { ["id"]=> string(2) "22" ["month"]=> string(1) "2" } as expected.

Why is the filter_input returning NULL? I've never had a problem retrieving GET data this way.

Solution

  • FITER_VALIDATE_INT should be FILTER_VALIDATE_INT. You are missing L in FILTER in all instances of the constant. Turning on error reporting would have thrown several Notice: Use of undefined constant FITER_VALIDATE_INT - assumed 'FITER_VALIDATE_INT' errors.