"disabled mb_list_*_names() and mb_list_encodings(arg) which are introduced in PHP 5.2.0RC to reconsider/discuss the specification." - hirokawa (http://cvs.php.net/viewvc.cgi/php-src/ext/mbstring/mbstring.c?r1=1.224.2.22.2.14&r2=1.224.2.22.2.15)

Guess we should simply remove those two files, but this will be tough for our version checker to understand

Maybe an experimental note like this?
http://www.php.net/manual/en/function.ncurses-putp.php

The problem is that the PHP_FUNCTION and {{ proto still exist in 5.2.0, 5.2.1, 5.2.2, but the function itself isn't actually registered (there's no actual PHP_FE for it).

The functable script (ie, the one that figures out which versions of PHP have which functions) can't check for proper PHP_FE registration; it only finds protos and PHP_FUNCTION declarations. It would become needlessly complex if we made it check for PHP_FE (it would have to check other files, make sure that entries aren't commented or #ifdefed, etc.).

This really is an edge case. I think it's very rare that we have function code that exists but doesn't get registered.

I propose we add a note to this page that says something like "This function does not actually exist in PHP 5.2.x, it can be enabled (without documentation or support) by hacking on the code here: http://cvs.php.net/viewvc.cgi/php-src/ext/mbstring/mbstring.c?view=markup"

S

This bug has been fixed in the documentation's XML sources. Since the
online and downloadable versions of the documentation need some time
to get updated, we would like to ask you to be a bit patient.

Thank you for the report, and for helping us make our documentation better.

Documentation removed for now.