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I received the following message on one of my boards:

Code: Select all: [phpBB Debug] PHP Notice: in file /includes/captcha/captcha_factory.php on line 38: Only variables should be assigned by reference

I disabled debug for now, so users are still able to register, but I'd really like to have both, debug and new users.

Replacing the =& with = as per asinshesq in the forum worked.

=& is correct, = incorrect. Could you please specify the the configuration when this happened?

Might be that some php4 versions do not allow for call_user_func to return a reference, in which case we could either accept a copy to be created (using =) or use eval. I'm fond of neither solution.