由于投了反對票，我重構了這個問題。就像這樣簡單：外部Docker容器：?  backoffice git:(master) ? php artisan tinkerPsy Shell v0.9.9 (PHP 7.2.15 — cli) by Justin Hileman>>> $ur = app(MDiPaolo\Repositories\UserRepository::class)=> App\Infrastructure\Repositories\Doctrine\UserDoctrineRepository {#3159}>>> $u = new MDiPaolo\Entities\User=> MDiPaolo\Entities\User {#3295}>>> $u->setEmail('[email protected]')=> MDiPaolo\Entities\User {#3295}>>> $u->setPassword(password_hash('1234', PASSWORD_BCRYPT))=> null>>> $ur->save($u)=> null>>>在docker容器內部：?  backoffice git:(master) ? docker exec -it backoffice_web_1 bashroot@042969f0229c:/var/www/html# php artisan tinkerPsy Shell v0.9.9 (PHP 7.2.17 — cli) by Justin Hileman>>> $ur = app(MDiPaolo\Repositories\UserRepository::class)Doctrine/DBAL/Exception/ConnectionException with message 'An exception occurred in driver: SQLSTATE[HY000] [2002] Connection refused'>>>我有種感覺，它與docker系統有關，例如兩個容器之間的通信或我如何構建它們。這是我的Dockerfile。FROM php:7.2-apacheRUN docker-php-ext-install pdo_mysql && docker-php-ext-enable pdo_mysqlRUN apt-get update && apt-get install nano && mv "$PHP_INI_DIR/php.ini-development" "$PHP_INI_DIR/php.ini"RUN a2enmod rewriteRUN service apache2 restartENV APACHE_DOCUMENT_ROOT=/var/www/html/publicRUN sed -ri -e 's!/var/www/html!${APACHE_DOCUMENT_ROOT}!g' /etc/apache2/sites-available/*.confRUN sed -ri -e 's!/var/www/!${APACHE_DOCUMENT_ROOT}!g' /etc/apache2/apache2.conf /etc/apache2/conf-available/*.confdocker-compose文件：version: '3.1'services:    web:        build: .        ports:            - "8080:80"        links:            - mysql        depends_on:            - mysql        volumes:            - ./:/var/www/html    mysql:        image: mysql:5.7.25        ports:            - "3306:3306"        environment:            MYSQL_ROOT_PASSWORD: backoffice