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Php sessions

Before you can store user information in your PHP session, you must first start up the session.
Note: The session_start() function must appear BEFORE the <html> tag.

<?php
session_start();
// store session data
$_SESSION['views']=1;
?>

<html>
<body>

<?php
//retrieve session data
echo "Pageviews=". $_SESSION['views'];
?>

</body>
</html> 

Destroying a Session

<?php
unset($_SESSION['views']);
?>  

 You can also completely destroy the session by calling the session_destroy() function: 

 

<?php
session_destroy();
?> 

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