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Pierre and all,
A while ago I suggested to add an UPGRADING file for the PHP 6 upgrade, where we'd document every time we break BC and how to solve that. For example, with nuking register_globals we could write what we broke, and if really needed, what 1-2 liners they can write to get the same behavior back (e.g. extract()).
Ilia and I owe the safe_mode docs. If anyone who broke something can take care of this that'll be great. The earlier we start the easier the PHP 6 upgrade will be and the less info we'll forget.
Andi