Psalm

Life is complicated. PHP can be, too. Psalm is designed to under­stand that complexity, so it can quickly pinpoint type errors in your codebase.

You should use Psalm if you run PHP 5.4+ or PHP 7.0+, and:

• you're worried about introducing errors in a big refactor, or
• you have a large team working on the same codebase, or
• you want to add your own application-specific type checks, or
• you just want the assurance that your codebase is type-safe.

Quickstart Guide

Install via Composer or download via GitHub:

composer require --dev vimeo/psalm

Add a config:

./vendor/bin/psalm --init

Then run Psalm:

./vendor/bin/psalm

The config created above will show you all issues in your code, but will emit INFO issues (as opposed to ERROR) for certain common trivial code problems. If you want a more lenient config you can specify the level with

./vendor/bin/psalm --init [source_dir] [level]

You can also learn how to suppress certain issues.

Want to know more? Check out the wiki!