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

What should you pay attention to when migrating a project from one framework to another? What should you pay attention to during the transition process?

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What should you pay attention to when migrating a project from one framework to another? What should you pay attention to during the transition process?

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

Each framework’s calls to MVC are inconsistent and need to be replaced

Some places use the built-in library implementation of the original framework and need to be changed

I can’t finish it...don’t change the frame if you have nothing to do

As long as the test passes without any attention, prepare an online rollback plan