I have had a “regular” web site for 18 years. It has grown to about 900 files going back that long. If I want to change the header, the footer, the side bar design throughout, with an html based site, I need to go from file to file to file to get this done.
This Summer I converted a large chunk of my site to PHP.
I only used ONE LINE OF PHP CODE to do it. This is Real Life PHP. My php is not good enough to send a rocket ship to Mars, but with the one line of real life php I know, I have made my life much easier.
Right now, not important to know the CSS for the video, the concept is a life saver.