PHP 4 is no more, with the last PHP 4.4.8 release the end as come. In the past eight years PHP 4 provided people a web-focussed language, solving many web-related problems. Since a few years a much improved version has slowly been taking over market share from PHP 4 - now at more than 25%. We, the PHP core developers, want to put our development power on the future technologies. Because of this, we will no longer support PHP 4 with the exception of possible releases addressing security issues until 2008-08-08.

PHP 5, especially PHP 5.2 and later, offers a much more stable, faster, and feature-rich web application development environment. We would therefore recommend to upgrade as soon as possible, especially now PHP 4 support does no longer exist.

Now all that's left is a homage to PHP 4:

So long and thanks for all the fish
So sad that it should come to this
The future belongs to those who dare.