How I can delete all final keywords from my class and methods

I'm talking about: http://php.net/manual/en/language.oop5.final.php

Why I need this: https://phpunit.de/manual/current/en/test-doubles.html
Final, private and static methods cannot be stubbed or mocked. They are ignored by PHPUnit's test double functionality and retain their original behavior.

Off course I want to delete "final" only during a test execution.