You got me really excited there for a second when I saw the post title. I thought "wow finally, a way to download the PHP source files of a website". Imagine my disappointment when I realized it was just a way to download the source files for building PHP itself
Too bad it's impossible to download the actual PHP source file of a page - disadvantages of it being a server-side language I suppose... or advantage if you want to protect your code.
Article title was a little misleading - for me at least.