You are Here: FAQ ->Scripting and Programming Languages->PHP->PHP Upgrades->Article #4


What is the difference between PHP 3 and PHP 4?


According to The PHP Group:

PHP 4 and the integrated Zend engine have greatly improved PHP's performance and
capabilities, but great care has been taken to break as little existing code as
possible. So migrating your code from PHP 3 to 4 should be much easier than
migrating from PHP/FI 2 to PHP 3. A lot of existing PHP 3 code should be ready to
run without changes, but you should still know about the few differences and take
care to test your code before switching versions in production environments.

Click here to read the online manual:
Migrating from PHP 3 to PHP 4

PHP version 3 will no longer be supported after the upgrade of our servers.
Scripts that are written in PHP 3 will be parsed by the PHP 4 compiler.

Please note: For technical reasons, it is not possible for 1&1 to offer
support for self programmed scripts. You are responsible for the security
and compatibility of your own scripts with our systems.


Find out more...
How can I find out which version of PHP I am using?
How can I check the PHP settings on the server?


Print Article
How useful was this article?
(From 5 = Very Useful to 1 = Not useful at all):
1 2 3 4 5


 © 2008 1&1 Internet Inc - About 1&1 Internet