Psalm is a static analysis tool for finding errors in PHP applications.
- v0.3.x supports checking PHP 5.4 - 7.1 code, and requires PHP 5.6+ to run.
- v0.2.x supports checking PHP 5.4 - 7.0 code and requires PHP 5.4+ to run.
Install via Composer:
composer require --dev vimeo/psalm
Add a config:
Then run 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.
How Psalm Works
A basic rundown of Psalm’s internals can be found in docs/how_psalm_works.md.