KayaMemo

"require": {
  ...
  "predis/predis": "1.0.1",
  ...
}

<?php
class RedisSessionHandler implements SessionHandlerInterface
{
    public $ttl = 1800; // 30 minutes default
    protected $db;
    protected $prefix;
 
    public function __construct(PredisClient $db, $prefix = 'PHPSESSID:') {
        $this->db = $db;
        $this->prefix = $prefix;
    }
 
    public function open($savePath, $sessionName) {
        // No action necessary because connection is injected
        // in constructor and arguments are not applicable.
    }
 
    public function close() {
        $this->db = null;
        unset($this->db);
    }
 
    public function read($id) {
        $id = $this->prefix . $id;
        $sessData = $this->db->get($id);
        $this->db->expire($id, $this->ttl);
        return $sessData;
    }
 
    public function write($id, $data) {
        $id = $this->prefix . $id;
        $this->db->set($id, $data);
        $this->db->expire($id, $this->ttl);
    }
 
    public function destroy($id) {
        $this->db->del($this->prefix . $id);
    }
 
    public function gc($maxLifetime) {
        // no action necessary because using EXPIRE
    }
}

<?php
require_once( dirname(__FILE__). "/vendor/autoload.php" );
require_once( dirname(__FILE__). "/RedisSessionHandler.php" );

$redis = new Predis\Client([
    'host' => parse_url($_ENV['REDIS_URL'], PHP_URL_HOST),
    'port' => parse_url($_ENV['REDIS_URL'], PHP_URL_PORT),
    'password' => parse_url($_ENV['REDIS_URL'], PHP_URL_PASS),
]);
$sessHandler = new RedisSessionHandler($redis);
session_set_save_handler($sessHandler);
session_start();