Several php projects (including phpMyAdmin, CiviCRM and Drupal) have come together to push forward php5 and have agreed that effective February 5th, 2008, any new feature releases will have a minimum version requirement of at least PHP 5.2.0.
Find out more on gophp5.org.
PHP announced today that support for PHP 4 will stop at the end of this year.
Today it is exactly three years ago since PHP 5 has been released. In those three years it has seen many improvements over PHP 4. PHP 5 is fast, stable & production-ready and as PHP 6 is on the way, PHP 4 will be discontinued.
The PHP development team hereby announces that support for PHP 4 will continue until the end of this year only. After 2007-12-31 there will be no more releases of PHP 4.4. We will continue to make critical security fixes available on a case-by-case basis until 2008-08-08. Please use the rest of this year to make your application suitable to run on PHP 5.
For documentation on migration for PHP 4 to PHP 5, we would like to point you to our migration guide. There is additional information available in the PHP 5.0 to PHP 5.1 and PHP 5.1 to PHP 5.2 migration guides as well.