Php is an old lover to me, I haven't even touched it in the last decade. Revisiting this tech is very tempting, especially when I look at the first line of the changelog for all the things I missed:

> Switch to using Zend Engine 2, which includes numerous engine level improvements.

Does anyone have an executive summary of how Php evolved since the 4.3 days? Where there any fundamental changes anyone should be aware of?