<?php

/*

* This file is part of the Predis package.

*

* (c) 2009-2020 Daniele Alessandri

* (c) 2021-2026 Till Krüss

*

* For the full copyright and license information, please view the LICENSE

* file that was distributed with this source code.

*/

require __DIR__ . '/shared.php';

// This example demonstrates how to use Predis to save PHP sessions on Redis.

//

// The value of `session.gc_maxlifetime` in `php.ini` will be used by default as

// the TTL for keys holding session data but this value can be overridden when

// creating the session handler instance using the `gc_maxlifetime` option.

//

// NOTE: this class requires PHP >= 5.4 but can be used on PHP 5.3 if a polyfill

// for SessionHandlerInterface is provided either by you or an external package

// like `symfony/http-foundation`.

//

// See http://www.php.net/class.sessionhandlerinterface.php for more details.

//

if (!interface_exists('SessionHandlerInterface')) {

exit('ATTENTION: the session handler implemented by Predis requires PHP >= 5.4.0 ' .

"or a polyfill for SessionHandlerInterface provided by an external package.\n");

}

// Instantiate a new client just like you would normally do. Using a prefix for

// keys will effectively prefix all session keys with the specified string.

$client = new Predis\Client($single_server, ['prefix' => 'sessions:']);

// Set `gc_maxlifetime` to specify a time-to-live of 5 seconds for session keys.

$handler = new Predis\Session\Handler($client, ['gc_maxlifetime' => 5]);

// Register the session handler.

$handler->register();

// We just set a fixed session ID only for the sake of our example.

session_id('example_session_id');

session_start();

if (isset($_SESSION['foo'])) {

echo "Session has `foo` set to {$_SESSION['foo']}", PHP_EOL;

} else {

$_SESSION['foo'] = $value = mt_rand();

echo "Empty session, `foo` has been set with $value", PHP_EOL;

}