PHP4? huh? – you still thinking about this? – dont do that!
Support for PHP4 has been discontinued since 31 December 2007. There will be no further development for this version. So it is highly recommended that you should code new websites and programs in PHP 5.x only. Also, if possible try to upgrade your existing applications also to PHP 5.x.
PHP 5.2.5 is the latest stable version at present (as on 03 Mar 2008). You can find some of the new features at http://devzone.zend.com/node/view/id/1714
You can download the PHP Source code and binaries from here.
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But some support and enhancements for PHP 4 will be given for some more time, right? For example, you can see some security enhancements dated 3rd January at http://php.net/
Bug fixes and patches will be available. Only development has been frozen. Even if you request a new feature, it will be added to PHP 5.x only and not 4.x.