No. Zend Framework was built to use all of the sophisticated
object oriented features of PHP 5 and take advantage of significant performance and security
enhancements.
Another consideration was support of the platform ZF would be running on. The P
HP community
officially discontinued support for PHP 4 as of 2008
-
01
-
01, and no critical security updates will be
published for PHP 4 after 2008
-
08
-
08.
These factors, among others, convinced us that PHP 5 was the best platform for Zend Framework and
applic
ations built on ZF.