I have some PHP code that is does not have good test coverage and is not easily testable in its current state. If I use commands from the refactor menu of PhpStorm, and make no other changes, how sure can I be that this won't change the behaviour of my application?
How safe are other automatic refactoring tools?
My understanding is that these tools will apply static analysis and could only cause changes to behaviour if the application does something very weird like depending on the output of debug_backtrace()