I'm having a problem with this same example. I'm on a mac and set up my server with MAMP as outlined in the book. I was able to successfully complete the "today" example from chapter 1 but with this example when I type the URL into my browser (http://localhost/name.html) all I get is a page of code:
<title>Query String Link Example</title>
<p><a href="name.php?name=Kevin">Hi, I’m Kevin!</a></p>
I copied the code from https://github.com/spbooks/PHPMYSQL5/tree/master/chapter3/links1 and pasted them into text edit files and saved them as name.html and name.php.html in the htdocs folder in the MAMP folder in Applications.