See available Downgrade rules

This package is already part of rector/rector package, so it works out of the box.

All you need to do is install the main package, and you're good to go:

composer require rector/rector --dev

To add a set to your config, use Rector\Set\ValueObject\DowngradeLevelSetList class and pick target set:

use Rector\Config\RectorConfig;

return RectorConfig::configure()
    ->withDowngradeSets(php72: true);

Then run Rector to downgrade your code to PHP 7.2!

vendor/bin/rector

It's simple in the nature. Read these how-to posts to get the idea:

• How all Frameworks can Bump to PHP 8.1 and You can Keep Using Older PHP
• Introducing ECS Prefixed and Downgraded to PHP 7.1
• How to bump Minimal PHP Version without Leaving Anyone Behind?
• Rector 0.10 Released - with PHP 7.1 Support

Rector is a tool that we develop and share for free, so anyone can save hundreds of hours on refactoring. But not everyone has time to understand Rector and AST complexity. You have 2 ways to speed this process up:

• read a book - The Power of Automated Refactoring
• hire our experienced team to improve your code base

Both ways support us to and improve Rector in sustainable way by learning from practical projects.