Dead code detector

PHPStan rules to find dead code in your project.

Installation:

composer require --dev shipmonk/dead-code-detector

Use official extension-installer or just load the rules:

includes:
    - vendor/shipmonk/dead-code-detector/rules.neon

Configuration:

• All entrypoints of your code (controllers, consumers, commands, ...) need to be known to the detector to get proper results
• By default, all overridden methods which declaration originates inside vendor are considered entrypoints
• Also, there are some built-in providers for some magic calls that occur in doctrine, symfony, phpstan and phpunit
• For everything else, you can implement your own entrypoint provider, just tag it with shipmonk.deadCode.entrypointProvider and implement ShipMonk\PHPStan\DeadCode\Provider\EntrypointProvider

# phpstan.neon.dist
services:
    -
        class: App\MyEntrypointProvider
        tags:
            - shipmonk.deadCode.entrypointProvider

use ReflectionMethod;
use ShipMonk\PHPStan\DeadCode\Provider\EntrypointProvider;

class MyEntrypointProvider implements EntrypointProvider
{

    public function isEntrypoint(ReflectionMethod $method): bool
    {
        return $method->getDeclaringClass()->implementsInterface(ApiOutput::class));
    }
}

Limitations:

• Only method calls are detected
  • Including static methods, trait methods, interface methods, first class callables, etc.
  • Any calls on mixed types are not detected, e.g. $unknownClass->method()
  • Expression method calls are not detected, e.g. $this->$methodName()
  • Anonymous classes are ignored
  • Does not check magic methods
  • No transitive check is performed (dead method called only from dead method)
  • No dead cycles are detected (e.g. dead method calling itself)

Contributing

• Check your code by composer check
• Autofix coding-style by composer fix:cs
• All functionality must be tested

Supported PHP versions

• PHP 7.4 - 8.3