# PHP version issues

**URL:** <https://forum.kirupa.com/t/php-version-issues/201439>\
**Category:** programming\
**Created:** [September 21, 2006, 9:09am UTC](https://forum.kirupa.com/t/php-version-issues/201439 "2006-09-21T09:09:57Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![opel](https://yyz1.discourse-cdn.com/flex011/user_avatar/forum.kirupa.com/opel/32/199_2.png) [@opel](https://forum.kirupa.com/u/opel)\
**Post date:** [September 21, 2006, 9:09am UTC](https://forum.kirupa.com/t/php-version-issues/201439/1 "2006-09-21T09:09:57Z")

</div>

I run PHP 5 and My SQL 4.1 on my Mac and I am in middle of building a CMS system. Someone that will be using this small CMS system is running a server with PHP 4.4.2 and MySQL 4.0.27.

As long as I do not use any PHP 5 only functions should I have any problems using the CMS system on their server? My biggest concern is exporting the MySQL 4.1 DB to the older 4.0 version.