PHPStan Symfony Framework extensions and rules

• PHPStan

This extension provides following features:

• Provides correct return type for ContainerInterface::get() and ::has() methods.
• Provides correct return type for Controller::get() and ::has() methods.
• Provides correct return type for Request::getContent() method based on the $asResource parameter.
• Notifies you when you try to get an unregistered service from the container.
• Notifies you when you try to get a private service from the container.

Usage

To use this extension, require it in Composer:

composer require --dev phpstan/phpstan-symfony

And include extension.neon in your project's PHPStan config:

includes:
	- vendor/phpstan/phpstan-symfony/extension.neon
parameters:
	symfony:
		container_xml_path: %rootDir%/../../../var/cache/dev/srcDevDebugProjectContainer.xml
		# or with Symfony 4.2+
		container_xml_path: '%rootDir%/../../../var/cache/dev/srcApp_KernelDevDebugContainer.xml' 

You have to provide a path to srcDevDebugProjectContainer.xml or similar xml file describing your container.

Constant hassers

Sometimes, when you are dealing with optional dependencies, the ::has() methods can cause problems. For example, the following construct would complain that the condition is always either on or off, depending on whether you have the dependency for service installed:

if ($this->has('service')) {
    // ...
}

In that case, you can disable the ::has() method return type resolving like this:

parameters:
	symfony:
		constant_hassers: false

Be aware that it may hide genuine errors in your application.