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1c182674b0
We destroy classes of dl()'ed modules in clean_module_classes(), during shutdown. Child classes of a module use structures of the parent class (such as inherited properties), which are destroyed earlier, so we have a use-after-free when destroying a child class. Here I destroy classes in reverse order, as it is done in zend_shutdown() for persistent classes. Fixes GH-17961 Fixes GH-15367