Autoincrement numeric variable in PHP on Refresh

Question

How do I use PHP to auto-increment a numeric variable on page refresh?

Foe example, for $i=10 there is an output of this:

Page has be

Answer 1

if it's for the same user session, use a session

session_start();
if (!isset($_SESSION['counter'])) $_SESSION['counter'] = 0;
$_SESSION['counter']++;

otherwise, if you want the same count for all users, use database