Why is PHP 4.3.11 the minimum version?

We test OpenX 2.4 with the latest release of PHP 4.3, 4.4, 5.0, 5.1 and 5.2. You should always upgrade your PHP version to the latest release, to ensure that you have the most stable, bug free and secure version of PHP that is available. Contact your hosting provider and ask them to upgrade your system if they manage your hosting.

If you're stuck on PHP < 4.3.11, and simply cannot upgrade, you can install OpenX anyway. However, we cannot provide any guarantee that OpenX will work correctly, and we are unlikely to be able to help you with any problems that arise if those problems are a result of running a (very) old version of PHP.

Please note: There are known bugs in PHP 4.4.1 that prevent OpenX from working. As a result, OpenX 2.4 will not allow you to install on this version.