Zend API

Hello together, I have read a lot about php extensions now, among other things the zend-api documentation. This documentation provides some basic information about how to acces variables - but only for simple types (e.g strings etc). Unfotunately I couldn't find any information about arrays and objects (which are stored in hash-tables) - neither in the documentation nor in the sourcecode. Does anyone know where I can get further information? Thx, Axel