Twig. New Django/Liquid style templating engine for PHP with an emphasis on speed, security and flexibility. I like the look of this a lot – although the extension process seems more convoluted than with Smarty.

An interesting article over at ParticleTree on hitting PHP’s memory limit when instantiating a lot of objects

It’s hard to imagine pushing the limits of object oriented PHP so far that your web servers choke, but the truth is those limits are reached faster than you think. — Ryan Campbell

I’ve run into this problem a number of times myself, and always with regards to the example Ryan provides – a script that exports a large database table to a CSV. I didn’t realise that it was the object instantiation that was sucking up all the memory – although perhaps this seems obvious in retrospect.