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本文档使用
php.cn手册 发布
文字
Compose 支持在.env放在docker-compose执行该命令的文件夹（当前工作目录）中的环境文件中声明默认环境变量。
语法规则
这些语法规则适用于.env档案：
以
VAR=VAL格式组合期望env文件。
以
#（即注释）开头的行被忽略。
空行被忽略。
没有特殊的引号处理（即它们将成为 VAL 的一部分，你已经被警告;））。
编写文件和 CLI 变量
这里定义的环境变量将用于变量替换在撰写文件中，并且还可以用于定义以下内容 CLI 变量
COMPOSE_API_VERSION
COMPOSE_CONVERT_WINDOWS_PATHS
COMPOSE_FILE
COMPOSE_HTTP_TIMEOUT
COMPOSE_TLS_VERSION
COMPOSE_PROJECT_NAME
DOCKER_CERT_PATH
DOCKER_HOST
DOCKER_TLS_VERIFY
注记
运行时环境中存在的值将始终覆盖在
.env档案。同样，通过命令行参数传递的值也优先。
中定义的环境变量。
.env文件在容器中不自动可见。若要设置适用于容器的环境变量，请遵循本主题中的指导方针。组合中的环境变量，描述如何将 shell 环境变量传递到容器，在复合文件中定义环境变量等等。
更多撰写文档
用户指南
命令行引用
合成文件引用