Page Refresh Counter Using Cookies in PHP

Let's create a page refresh counter:

<?php
	if (!isset($_COOKIE['counter'])) { // first visit to the page
		setcookie('counter', 1);
		$_COOKIE['counter'] = 1;
	} else {
		setcookie('counter', $_COOKIE['counter'] + 1);
		$_COOKIE['counter'] = $_COOKIE['counter'] + 1;
	}
	
	echo $_COOKIE['counter'];
?>

The code can be simplified using the ++ operator:

<?php
	if (!isset($_COOKIE['counter'])) { // first visit to the page
		setcookie('counter', 1);
		$_COOKIE['counter'] = 1;
	} else {
		setcookie('counter', ++$_COOKIE['counter']);
	}
	
	echo $_COOKIE['counter'];
?>

Record the timestamp of the user's first visit to the page in a cookie. Upon page refresh, display how much time has passed since the moment of the first visit to the page.