Answer 1

You can use like this..

<?php

session_start(); //It is important to use session

if( isset( $_SESSION['counter'] ) ) {
$_SESSION['counter'] += 1;
} else {
$_SESSION['counter'] = 1;
}

$msg = "You have visited this page ". $_SESSION['counter'];

$msg .= "in this session.";

?>

To end session..

<?php session_destroy(); ?>

It will destroy all the session variables.

Get more information From official website...

https://www.php.net/manual/en/reserved.variables.session.php