How to check whether a variable in $_GET Array is an integer?

Question

I have a page like so:

http://sitename/gallery.php?page=2

It has pagination links at the bottom by which we can br

Answer 1

if (isset($_GET['page']) && (($get_page_filtered = filter_var($_GET['page'], FILTER_VALIDATE_INT)) !== FALSE) {
  $get_page_int = $get_page_filtered;
}

@see https://stackoverflow.com/a/41868665/6758130