psalm/docs/plugins.md

Plugins

Psalm can be extended through plugins to find domain-specific issues.

All plugins must extend Psalm\Plugin and return an instance of themselves e.g.

<?php
class SomePlugin extends \Psalm\Plugin
{
}
return new SomePlugin;

Psalm\Plugin offers two methods that you can override:

• afterStatementsCheck - called after Psalm evaluates each statement
• afterExpressionCheck - called after Psalm evaluates each expression

An example plugin that checks class references in strings is provided here.

To ensure your plugin runs when Psalm does, add it to your config:

    <plugins>
        <plugin filename="src/plugins/SomePlugin.php" />
    </plugins>