Tool cheatsheet

Composer 2 Cheatsheet

Manage PHP dependencies, autoloading, scripts and project creation with Composer 2.

Setup

Check the Composer version — Print the installed Composer version.
Update Composer — Update Composer itself to the latest release.
Create a composer.json — Create composer.json interactively in the current folder.
Create a project from a package — Create a new project from a package, here a Laravel application.
Diagnose problems — Check your system and Composer setup for common problems.
Validate composer.json — Check composer.json for errors and warnings.

Install dependencies — Install the exact versions listed in composer.lock, or resolve and write a lock file if none exists.
Add a package — Add a package to composer.json and install it.
Add a development package — Add a package needed only during development, such as a test framework.
Add a package at a version — Require a version constraint. ^7.0 allows any 7.x release at or above 7.0.
Remove a package — Remove a package from composer.json and the vendor folder.
Update all packages — Update dependencies to the newest versions allowed by composer.json, and rewrite composer.lock.
Update one package — Update a single package and the dependencies it needs.
Find outdated packages — List installed packages that have newer versions.
Find outdated direct dependencies — Limit the list to packages you require directly.
List installed packages — List installed packages with their versions.
Show the dependency tree — Print installed packages and their dependencies as a tree.
Find why a package is installed — List the packages that depend on a given package.
Find why a version can't be installed — Explain which requirements block installing a package or version.
Check for security advisories — Check installed packages for known vulnerabilities.

Regenerate the autoloader — Rebuild the autoload files after adding classes or changing the autoload section.
Optimize the autoloader — Generate a class map for faster autoloading in production.
Install for production — Install without development packages and with an optimized autoloader.
Run a script — Run a script defined in the scripts section of composer.json.
Allow a plugin — Composer 2.2 and later ask you to allow plugins explicitly. Allow one by name.
Clear Composer's cache — Delete the packages Composer has downloaded and cached.
Install a tool globally — Install a package into your global Composer folder, for command-line tools.

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