This lab series is not a tutorial on writing PHP programs or scripting dynamic Web pages. Rather its intent is to demonstrate how you can use PHP to separate the different elements that make up a well designed and valid Web page into their component parts and have these parts adapt in certain powerful ways. These components correlate almost exactly with the modular design of XHTML itself. Any number of other Open Source languages such as Perl or Python could be used to achieve the same goal. Or commercial ones certainly, but let’s not go there.
Link: Building Modular XHTML Web Pages with PHP - loadaverageZero