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Psalm is a static analysis tool for finding errors in PHP applications.

Version 0.3.x supports checking PHP 5.4 - 7.1 code, and requires PHP 5.5 and higher to run.

Version 0.2.x supports checking PHP 5.4 - 7.0 code and requires PHP 5.4 and higher to run.

Check out the wiki!

Quickstart Guide

Install via Composer:

composer require --dev "vimeo/psalm:dev-master"
composer install

Add a psalm.xml config:

cat > psalm.xml << EOF
<?xml version="1.0"?>
<psalm
  stopOnFirstError="false"
  useDocblockTypes="true"
>
    <inspectFiles>
        <directory name="src" />
    </inspectFiles>
</psalm>
EOF

Then run Psalm with:

./vendor/bin/psalm

The above config is spartan, and will show you all possible errors, including many that are likely irrelevant to you. A more lenient config is provided here.