How to properly switch Yii2 error handler to default in PHP?

Question

Yii

Hello!
It was necessary to replace strings in a fairly large array of files on a Yii2 project. After a mass replacement, I messed up somewhere (probably the replacement affected some name of a method or class, etc.). Yii2 crashed with Headers already send error and that's it. I'm looking for a way to properly switch Yii2's error handling to PHP's standard handler to see the real error. So, I wanted to make it faster and easier, but it turned out through a red-eyed debug.
Git is configured on the project and I made a commit before the jamb, maybe you can at least somehow roll back file changes to this commit?