Composer runs on macOS and Linux wherever a supported PHP CLI runtime is available. Installation method determines how it is updated.
What It Does
Homebrew manages PHP and Composer together. Package manager installations are controlled by your distribution release.
Requirements and Compatibility
Use a supported PHP runtime and install any third-party tool or extension explicitly shown in the examples. Commands should be run from the project root unless stated otherwise.
Syntax, Inputs and Results
The examples separate configuration, the smallest working operation and a realistic follow-up task. Adapt file paths and dependency versions to your own project.
Example 1: Basic Use
Homebrew manages PHP and Composer together.
# macOS:
brew install php composer
composer -VExample 2: Another Case
Package manager installations are controlled by your distribution release.
# Ubuntu or Debian:
sudo apt update
sudo apt install php-cli composer
php -v && composer -VPractical Example
Validate the installation and an existing project manifest.
composer diagnose
composer validate --strictFor production, apply the compatibility and edge-case limits described below.
Important Behavior and Edge Cases
Platform package repositories may deliver an older Composer release; check the installed version before following version-specific instructions.
Comparison with Related Functions and Tools
| Subject | Key difference |
|---|---|
| composer install vs composer update | install follows composer.lock; update resolves new versions and updates the lock file. |
Common Beginner Mistakes
| Mistake | Correct approach |
|---|---|
| Treating a version range as a fixed installed version | Commit composer.lock for applications and run composer install in deployment. |
| Skipping the prerequisite of this specific workflow | Install or configure the named tool and confirm the example can actually run. |
| Ignoring edge conditions | Platform package repositories may deliver an older Composer release; check the installed version before following version-specific instructions. |
Key Takeaways
- Composer runs on macOS and Linux wherever a supported PHP CLI runtime is available. Installation method determines how it is updated.
- Platform package repositories may deliver an older Composer release; check the installed version before following version-specific instructions.
- Keep application configuration, source code and validation tests under version control.
Use these examples as a starting point, then validate the result with the actual PHP build, dependencies and inputs used by your application.