I hope more people and projects decide to support this initiative.
PHP 4 has served the web developer community for seven years now, and served it well. However, it also shows its age. Most of PHP 4’s shortcomings have been addressed by PHP 5, released three years ago, but the transition from PHP 4 to PHP 5 has been slow for a number of reasons.
PHP developers cannot leverage PHP 5’s full potential without dropping support for PHP 4, but PHP 4 is still installed on a majority of shared web hosts and users would then be forced to switch to a different application. Web hosts cannot upgrade their servers to PHP 5 without making it impossible for their users to run PHP 4-targeted web apps, and have no incentive to go to the effort of testing and deploying PHP 5 while most web apps are still compatible with PHP 4 and the PHP development team still provides maintenance support for PHP 4. The PHP development team, of course, can’t drop maintenance support for PHP 4 while most web hosts still run PHP 4. </i>
To learn more about this please visit: Go PHP5