PHP has kind of taken the i5 world by storm. Many RPG developers want to move their applications to the web, but while there are options for doing so, RPG is not all that well suited for writing web applications unless you invest heavily in a CGI framework like DEV2. The other option has been Java, which represents a completely different way of coding that many RPG developers are not overly comfortable with. Alongside that, there is the standard issue of Java taking some time to learn properly. So along comes PHP and it gives the RPG developers a chance to ease into programming for the web. They can still use procedural programming when they start, but they can also move to more structured applications as they become more familiar with the language.