book_admin/application/extra/session.php

<?php

use think\Env;

return [
    'prefix' => Env::get('session.prefix', ''),
    'type' => Env::get('session.type', ''),
    'host' => Env::get('session.host', ''),
    'port' => Env::get('session.port', ''),
    'password' => Env::get('session.password', ''),
];