Hi,
Your best approach will be to take the newer PHP library.
The newer API does not have full coverage for all the features, but it does give you access to the underlying web service clients so these can be used in the mean time whilst we develop out the main API.
It is the plan, in the very near future, to move the current PHP library off the forge into svn HEAD. There will also be other work done to improve our PHP capabilities, including looking at embedding PHP scripting and templating into the repository itself and providing integrations for some popular PHP products.
In short the PHP library will continue to be developed and improved.
Cheers,
Roy