What should I pay attention to when migrating the linux-php project framework?

What should I pay attention to when migrating a project from one framework to another? What are precautions during the transition? What should I pay attention to when migrating a project from one framework to another? What are precautions during the transition?

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What should I pay attention to when migrating a project from one framework to another? What are precautions during the transition?

A lot...
For example, to operate a database, if you rely on the built-in modules of the original framework to operate the database, such as the mysqli chain call of CI, when migrating to the new framework, note whether to use mysql, mysqli, or pdo.

The calls of each framework to MVC are inconsistent.

In some cases, the built-in library implementation of the original framework needs to be changed.

I can't finish it... nothing to do. don't change the framework.

If the test is passed, prepare an online rollback solution.