Object type determined at runtime

Hey everyone. I have a question. Hopefully it's clear, because I'm not sure quite how to ask it. Basically, I have a variety of different objects that a variable can be instantiated as in the same block of code, its type being determined at runtime. I want to be able to do something like this: $object = new $objType(); Where $objType is the type of object, which must be determined at runtime. I'm sure the syntax I have above is incorrect. My question is, is there any way that I can determine the object's type at runtime and do the same type of thing? Thanks! James