If you want to use the PHPStan Symfony analysis and encounter an error with PHPParser, you should create a new Symfony environment with inlining deactivated. Here is why!
PHPStan is a very handy tool that will analyze your code and tell you what leftover errors there might be.
It also provides us with the possibility of analyzing our own project console application, as explained in the documentation.
However, after trying to use it in one of our project, we encountered an unexpected error coming from the vendors after running
php vendor/bin/phpstan analyse:
Compile Error: Cannot Declare interface PhpParser\NodeVisitor, because the name is already in use.
This seemed pretty weird and we didn’t know where it was coming from. Still, we were sure it was due to the console analysis because the regular PHPStan analysis was working fine. So, we decided to open an issue on PHPStan which led to an issue on Symfony.
That’s where we learnt that the issue was due to Symfony’s inlining trying to load an external library that was already loaded by PHPStan. So, in order to make it work, we need to disable this inlining.
However, you don’t want to turn off inlining for your application because it greatly improves performance. Or, at least, you don’t want to turn it off for the regular environments of your application. But nothing prevents you from creating a special environment with the inlining disabled that will be used by PHPStan only.
So, head to your config directory and create a new environment for PHPStan:
Add a file that will disable inlining. You may give it any name:
parameters: container.dumper.inline_class_loader: false
And call it from the file that you use to load the console application (Your
console_application_loader in the official documentation):
require __DIR__.'../../../config/bootstrap.php'; $kernel = new \App\Kernel('phpstan', true); return new \Symfony\Bundle\FrameworkBundle\Console\Application($kernel);
And you’re done, everything now works just fine! If we run
php vendor/bin/phpstan analyse again:
We also opened a pull request on PHPStan to update the documentation if you want to check it out!