C'est la vie writes, "After a lengthy QA process, PHP 4.1.0 is finally out. As some of you may notice, this version is quite historical, as it's
the first time in history we actually incremented the middle digit! :)
The two key reasons for this unprecedented change were the new input
interface, and the broken binary compatibility of modules due to the
versioning support. Following is a description of the new input mechanism. For a full
list of changes in PHP 4.1.0, scroll down to the end of this section: http://www.php.net/release_4_1_0.php. Download at http://www.php.net/downloads.php."
December 11, 2001