All 7 PHP with Docker questions
More in PHP with Docker
What is a Dockerfile, and what basic instructions are typically included when building a Docker image for a PHP application? 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? 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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What is Docker, and what benefits does containerizing a PHP application provide compared to running it directly on a server?

Beginner

Answer

Docker lets you package an application along with all of its dependencies, including a specific PHP version, required extensions, and system libraries, into a portable, self contained container that runs consistently across any environment, whether on a developer's laptop, a testing server, or production, eliminating the common problem of an application working fine in one environment but failing in another due to subtle differences in installed software versions.
FROM php:8.2-fpm
COPY . /var/www/html
RUN docker-php-ext-install pdo_mysql
Real-world example A development team eliminates a long standing class of bugs caused by developers running different local PHP versions than production, by having everyone run the exact same Dockerized PHP environment both locally and in production.

Common follow-ups: What is the difference between a Docker image and a Docker container?;How does Docker compare to using a virtual machine for the same purpose?

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