new_sdk_wu/www/new_sdk/application/extra/kafka.php

<?php
use think\Env;

return [
    'bootstrap_servers' => Env::get('kafka.bootstrap_servers', 'localhost:9092'),
    'group_id' => Env::get('kafka.group_id', 'new_sdk_group'),
    'topics' => [
        'default' => Env::get('kafka.default_topic', 'new_sdk_topic')
    ],
    'debug' => Env::get('kafka.debug', false),
];