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Nel tutorial di oggi imparerete come applicare una scadenza personalizzata ad una sessione impostando la durata di "vita" di quest'ultima. Iniziamo!

 
< ?php
 
/**
 * Return false if session variable is no longer valid otherwise return the value that
 * the session variable holds.
 *
 * @param string $name Session variable name
 * @return bool|mixed true if var has expired otherwise return the value of the variable
 */
function getSessionVar($name)
{
    if (!isset($_SESSION[$name])
     || !isset($_SESSION[$name.'_expires'])
     || (isset($_SESSION[$name.'_expires']) && $_SESSION[$name.'_expires'] < time()))
    {
        return false;
    }
    return $_SESSION[$name];
}
 
/**
 * Set a session variable with an expiry time.
 *
 * @param string $name    Session variable name
 * @param mixed  $value   Could be a string, int, array, object
 * @param int    $expires The lifetime of the variable
 */
function setSessionVar($name, $value, $expires = 600)
{
    $_SESSION[$name] = $value;
    $_SESSION[$name.'_expires'] = time() + $expires;
}
 
 
// Example
 
if (!($total_messages = getSessionVar('total_messages')))
{
    $total_messages = getTotalMessages(); // Your own code to get the total
 
    setSessionVar('total_messages', $total_messages, 60);
}
 
// Use the variable $total_messages as you would normally
 
?>