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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 5.5+ to run.
  • v0.2.x supports checking PHP 5.4 - 7.0 code and requires PHP 5.4+ to run.

Check out the wiki or try a live demo!

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"
>
    <projectFiles>
        <directory name="src" />
    </projectFiles>
    <issueHandlers>
        <MissingReturnType errorLevel="info" />
        <MissingClosureReturnType errorLevel="info" />
        <MissingPropertyType errorLevel="info" />
    </issueHandlers>
</psalm>
EOF

Then run Psalm with:

./vendor/bin/psalm

The above config is fairly spartan, and will show you all possible errors, including many that might be irrelevant to you. A more lenient config is provided here, and you can learn about how to suppress certain issues here.