Which PHP functions and keywords instantiate a class?

Question

I'd like to know which PHP functions and keywords initiate the instantiation loading of a class definition file.

I know of these two:

1. The new keyword
2. The class_exists() function (if called with $autoload argument set to true)

I'm sure there must be more, but I haven't been able to find any more.

Any additions to the list would be appreciated.