How to downgrade Symfony version?

@samara 

To downgrade the version of Symfony in your project, you will need to follow these steps:

1. Check the current version of Symfony by running the following command in your project directory:

1

symfony --version

1. Make a backup of your project. It is always a good idea to make a backup of your project before making any changes.
2. Open the composer.json file in the root of your project and find the "symfony/symfony" package.
3. Change the version constraint for the "symfony/symfony" package to the version you want to downgrade to. For example, if you want to downgrade to version 4.4, you would change the constraint to "4.4.*".
4. Run the following command to update the dependencies and install the new version of Symfony:

1

composer update symfony/symfony

1. If you have any custom code that is specific to the version of Symfony you are downgrading from, you will need to update it to be compatible with the new version. This may involve making changes to your code, updating dependencies, and/or updating configuration files.
2. Test your project to ensure that everything is working as expected with the new version of Symfony.

Note: Downgrading to a previous version of Symfony is not always possible, and may require significant effort. It is generally recommended to stay up to date with the latest version of Symfony to take advantage of new features and bug fixes.

@samara 

To downgrade Symfony to a specific version, you need to follow these steps:

1. Check the compatibility matrix: Symfony maintains a compatibility matrix on its website, which lists the supported versions for specific Symfony components. Make sure the version you want to downgrade to is supported by your currently installed components.
2. Update your composer.json: Open the composer.json file in the root directory of your Symfony project. Look for the "require" section, which lists all the required dependencies for your project. Modify the version constraint for the Symfony package to the desired version. For example, if you want to downgrade from Symfony 5.1 to Symfony 4.4, change the line from "symfony/symfony": "^5.1" to "symfony/symfony": "^4.4". This ensures that Composer fetches the desired version.
3. Update Composer: Run the command composer update in your project's root directory. Composer will analyze the changes in composer.json and fetch the new dependencies based on your modified version constraint.
4. Update the Symfony skeleton: If you are using the Symfony skeleton framework, you need to update it to the desired version as well. To do this, run the command composer require symfony/skeleton:
5. Validate Compatibility: Check the vendor compatibility for any potential issues. Run the command php bin/console about to ensure that all the Symfony components and their versions are correct and compatible.
6. Update Code and Configuration: Review your code and configuration files for any differences that may arise due to the version downgrade. Look out for deprecated/deleted features, changed configurations, or updated code.
7. Test: Run your application and perform thorough testing to ensure everything works as expected. Pay attention to any warnings or deprecation notices that may appear in the logs.

Remember that downgrading Symfony versions can introduce compatibility issues with other libraries or bundles that depend on specific Symfony versions. Always check the documentation and compatibility requirements of your other dependencies before downgrading Symfony.