[SOLVED] php - filter_input - set to default value if GET key not set

php - filter_input - set to default value if GET key not set

I'd like to have a clean, elegant way to set a variable to a GET parameter if said parameter is set (and numeric), and to 0 (or some other default) if it's not set.

Right now I have:

if (($get_id = filter_input(INPUT_GET, 'id', FILTER_VALIDATE_INT))) {
    $opened_staff['id'] = $get_id;
    // some database queries etc.
} else { $opened_staff['id'] = 0; }

I tried using a callback function that returns 0 if the value is null or not numeric, but if the GET parameter 'id' isn't set, the callback won't even be called - it just sets $get_id to null.

Not a big deal to include the else statement, just thought I might be missing out on some functionality of filter_input.

Solution

The filter_input function accepts an options parameter. Each filter accepts different options. For example, the FILTER_VALIDATE_INT filter can accept default, min_range and max_range options as described here.

$get_id = filter_input(INPUT_GET, 'id', FILTER_VALIDATE_INT, array("options" => array(
    "default" => 0,
    "min_range" => 0
)));
var_dump($get_id);

// $get_id = 0 when id is not present in query string, not an integer or negative
// $get_id = <that integer> otherwise