Today (July 13, 2007) exactly three years since the release of PHP5. During these three years, he (PHP5) has gained many improvements over PHP4. PHP5 is fast, stable, and since PHP6 is already on the way, the 4th PHP branch will not develop anymore.
The PHP development team announces that PHP4 support will last only until the end of this year. After December 31, 2007, PHP4.4 releases will no longer be released. “We will continue to release security fixes“ from time to time ”until August 8, 2008. Please use the time until the end of the year to make your applications compatible with PHP5. ”