Description:
------------
filter_input_array(INPUT_GET, $filters, true) does not add empty fields to the output array if the query string is absent. It does add them correctly if even one parameter appears.

Note that filter_var_array($_GET, $filters, true) does add the empty fields correctly.


Test script:
---------------
$getFilters = [
    'id'=>['filter'=>FILTER_VALIDATE_INT,
        'flags'=>FILTER_REQUIRE_SCALAR,
        'options'=>['min_range'=>1]
        ],
    'name'=>FILTER_UNSAFE_RAW
];

    echo '$_GET: <br>';
    var_dump($_GET);

    $req = filter_input_array(INPUT_GET, $getFilters, true);
    echo '<hr>$req:<br>';
    var_dump($req);

    echo '<hr>$reqGet<br>';
    $reqGet = filter_var_array($_GET, $getFilters, true);
    var_dump($reqGet);


Actual result:
--------------
Execute the above script with no query string gives this result:

$_GET:

array (size=0)
  empty

$req:

null

$reqGet

array (size=2)
  'id' => null
  'name' => null