XOOPS.org: "Therefore, our upcoming XOOPS 2.3.4 will be the last release compatible with PHP4. However, we will make sure that it is a solid release, that will serve our users for many months, if not years, to come, if they need to keep it on PHP4.
XOOPS 2.4 that will follow, will be only tested and certified exclusively on PHP 5.2 and up."
ComputerWorld: "Probably the simplest and most effective change that will come with PHP 5.3 is a modification to the way that $_REQUEST superglobal variables are handled. After several years of known vulnerability, it seems that the PHP developers are finally addressing one of the most risky elements of the scripting language."