PHP Mocking Final Class

Since you mentioned you don’t want to use any other framework, you are only leaving yourself one option: uopz

uopz is a black magic extension of the runkit-and-scary-stuff genre, intended to help with QA infrastructure.

uopz_flags is a function that can modify the flags of functions, methods and classes.

<?php
final class Test {}

/** ZEND_ACC_CLASS is defined as 0, just looks nicer ... **/

uopz_flags(Test::class, null, ZEND_ACC_CLASS);

$reflector = new ReflectionClass(Test::class);

var_dump($reflector->isFinal());
?>

Will yield

bool(false)