持久化登录解决方案

方案一：

将user_id,user_password,加密后存入cookie中，设置有效时长

if (!empty($_COOKIE['ECS']['user_id']) && !empty($_COOKIE['ECS']['password'])) {
                $condition = array('user_id' => intval($_COOKIE['ECS']['user_id']), 'password' => $_COOKIE['ECS']['password']);
                $row = $this->db->table('users')->where($condition)->find();
                if (!$row) {
                    $time = time() - 3600;
                    cookie('ECS[user_id]', '');
                    cookie('ECS[password]', '');
                }
                else {
                    $_SESSION['user_id'] = $row['user_id'];
                    $_SESSION['user_name'] = $row['user_name'];
                    update_user_info();
                }
            }

方案二：

设置session_id的有效时长

session.use_cookies = 1
session.use_only_cookies = 1
session.cookie_lifetime = 604800

session.gc_maxlifetime = 604800