PHP5 has some new tricks up its sleeve when it comes to dates and times. Most of these additions come in the form of new functions.
From The Blog
In version 5, PHP finally puts its toe into the namespace water.
Ensuring a safe website experience will gain the trust of your customers.
In version 5, PHP added a “magic” function for the convenience of class loading.
PHP5 has some new functions for working with arrays. Here’s an overview.