At 06:44 AM 6/21/2002 -0400, fabwash wrote: >Hello, > >I already sent this question, but there was no answer, and i'm afraid it >was not noticed, but if this is the wrong list, let me know :) > > >When you define a constant you can use two things that are not very clear >to me. Can someone explain? > >1) CONST_PERSISTENT. How can a constant be persistent? The documentation >says that the constant is not "forgotten" after the process stops. Well if >the process stops, where is the constant stored? I couldn't find any place >where the constant would be written to a file or some location. > >Then when then module is started again, all programs I have looked at >register those same constants again, so what is the point of making them >persistent? Something is not getting into my small brain, there. > >2) REGISTER_MAIN_.. Those are supposed to remain in the symbol table. The >only symbol table I see is the Zend constant symbol table. So if the >process ends, then they're lost, and that's fine with me. But if a module >registers a constant as MAIN, then gets unloaded, the constants stay, >available for other modules I guess. > >So I understand REGISTER_MAIN (I think), although I don't really see the >point, but i'm totally not clear about CONST_PERSISTENT. > >Anyone can explain?
Persistent constants survive in between requests. Usually this is used by extensions to define some constants such as the constant PREG_PATTERN_ORDER. It is registered at module startup. Of course it'll die if the Apache process dies. Andi -- PHP Development Mailing List <http://www.php.net/> To unsubscribe, visit: http://www.php.net/unsub.php
