All 7 PHP with Docker questions
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What is Docker, and what benefits does containerizing a PHP application provide compared to running it directly on a server? What is a Dockerfile, and what basic instructions are typically included when building a Docker image for a PHP application? What is a multi stage Docker build, and how does it help produce a smaller, more secure production image for a PHP application? How do environment variables and Docker secrets help manage application configuration and sensitive credentials differently across development and production containerized environments? How should a team design their Docker based deployment pipeline for a PHP application to ensure the exact same tested image is what actually reaches production? How does running PHP within Docker containers in a production Kubernetes environment introduce additional considerations around health checks, resource limits, and horizontal scaling?
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How does Docker Compose let you define and run a complete multi container PHP application setup, including a web server, PHP-FPM, and a database, together?

Intermediate

Answer

Docker Compose lets you define an entire multi container application, such as an Nginx web server, a PHP-FPM application container, and a MySQL database container, all within a single YAML configuration file, specifying how they should be networked together and what environment variables or volumes each service needs, letting you start your complete local development environment with a single command rather than manually configuring and starting each individual container yourself.
services:
  app:
    build: .
    volumes:
      - .:/var/www/html
  db:
    image: mysql:8.0
    environment:
      MYSQL_DATABASE: myapp
Real-world example A development team defines their entire local environment, including PHP-FPM, Nginx, and MySQL, in a single docker-compose.yml file, letting any new team member get a fully working local development environment running with a single docker compose up command.

Common follow-ups: How do containers defined in the same Docker Compose file communicate with each other by name?;What is the purpose of mounting a volume for local development compared to production?

PDO & Databases;Deployment & Hosting for PHP Applications
All 7 PHP with Docker questions