Although Dreamweaver MX contains a range of built-in PHP server behaviors to perform various operations, if you're building a complex site, you'll soon find that you want to do something for which there isn't a built-in server behavior. Since PHP is an open source product, it is widely supported by a range of open source developers and a huge user community. As a result PHP evolves much faster than other commercial languages, and the code is continuously updated with bug fixes, enhancements, and language extensions, which extend its capabilities. Hand coding allows you to implement the latest PHP developments in your code as soon as they are released. It offers you total freedom to ensure that your web site does exactly what you want it to, and you are not just limited to the built in code generated by your development program. Code that you've written yourself can also interact with the Dreamweaver MX generated code, so you can create standard code quickly using the Dreamweaver MX server behaviors, and then modify it yourself to perform extra functions. We're now going to look at the many ways you can create and edit code (both PHP and HTML) in Dreamweaver MX.