This is so natural - one thing dies and gives way to something new.
So goodbye PHP4, happy birthday PHP5 and hello PHP6.
This was long expected, but I'm still excited about it.
I don't really know. Actually I don't have enough time to study PHP but my codes are still running fine in PHP5. So that's not how it's running, but the differences in writing codes that really matters? Sorry for my english, "amigos".
But... Happy Birthday, PHP5 =)