Cannot declare class - Level symfony 34 throws an error on 2.8 Symfony Code

[theovach]

When I try to dry run with level symfony 3.4 on 2.8 code I get every time:
PHP v7.2.14
rector v0.3.37
PHP Fatal error: Cannot declare class Symfony\Component\HttpFoundation\ParameterBag, because the name is already in use in /var/www/html/adb_webapp/var/bootstrap.php.cache on line 6

[TomasVotruba]

How did you install Rector?

What exact command do you run?

This might be due to conflicting version of Symfony. Rector uses Symfony 3.4/4.2, your app probably older.

[theovach]

Installed via
composer require rector/rector --dev
Symfony is 3.4.21

[TomasVotruba]

What exact Rector command do you run?

[theovach]

What exact Rector command do you run?

./rector process {SYMFONY_PROJECT_FOLDER}/src --level symfony34 --dry-run

[TomasVotruba]

This issues is quite common. It's caused by the fact Rector loads Symfony coce from your project and from itself - twice.

The only solution in the future will be prefixed PHAR. It's being worked on in https://github.com/rectorphp/compiler
Any help there would make it sooner.

[TomasVotruba]

Duplicated issue to better described: #177

[TomasVotruba]

There is a solution now: https://github.com/rectorphp/rector-prefixed

[tuc0w]

@TomasVotruba I am using the latest prefixed version (0.7.2) in a Symfony 3.4 project and I am running the two sets 'php72' and 'symfony40'.

Fatal error: Cannot declare class XXXX\YYYYBundle\Entity\Xyz, because the name is already in use in /vagrant/yyyy/src/XXXX/YYYYBundle/Entity/Xyz.php on line 14

# rector.yaml
parameters:
    auto_import_names: true
    autoload_paths:
        - 'src/zzz/DrunkenWizardBundle'
        - 'src/zzz/OfficeOpenXmlBundle'
    exclude_paths:
        - '/src/zzz/OfficeOpenXmlBundle/Classes'
    paths:
        - 'src'
    sets:
        - 'php72'
        - 'symfony40'

Any idea why it is still happening?

[TomasVotruba]

Could you provide demo link?

https://getrector.org/demo