Studiati questo codice:

Codice PHP:
<?php 
session_start
();

if (isset(
$_GET['destroy'])) {
    
$_SESSION = array();
    
session_destroy();
    
session_write_close();
    
header('Location: ' $_SERVER['PHP_SELF'] . '?check=1');
    exit();
} elseif (!isset(
$_GET['check'])) {
    
$_SESSION['test'] = time();
}

print(
'<pre>');
print_r($_SESSION);
print(
'</pre>');

?>
[url="?destroy=1"]destroy session[/url]