I've been meaning to ask this... but I always thought I could find the answer online(I didn't). Back when PHP 5.0.1 was released, PHP 4.something else was released.
What was the main reasoning behind this move? Is it because PHP5 is more OOP(similar to java)?
PHP 4 is currently in maintenance mode. Generally it only means that there will be bugfix releases for it, without any new features. It might be possible that we'll release a PHP 4 version with a couple of new features at some point for people who don't upgrade, but they won't be major.
The reason for releasing these releases based on the 4 tree is to allow users who don't wish to upgrade (which at the very least requires some QA to make sure nothing went wrong, and in some cases requires some code adjustments) the ability to stick with the old codebase, and take a very low risk with a bugfix release.
Zeev
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