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

Using is_int won't help, probably. All incoming parameters (including $_GET and $_POST) are parsed as strings by PHP. The is_int function checks the datatype, not the value. ctype_digit checks for only digits though:

if(isset($_GET['page']) && ctype_digit($_GET['page']){
   $page = (int)$_GET['page'];
   echo "Page Number: ".$page;
}