Havard Eide has a recent post to his blog that looks at a part of the Standard PHP Library (SPL) that can be used with objects to store them for later use - SplObjectStorage.

In this post I will look at SplObjectStorage: a container that allows to store objects uniquely without the need to compare them one by one.

He lets the code to most of the talking, showing how to do the standard operations for a data store - adding objects (both unique and the same), updating objects in the store, checking to see if an object is already added and removing an object from storage.