You’ve spent your hard-earned money and purchased this book, so you undoubtedly know the enormous benefits of using PHP, Apache, and MySQL together to create your Web site. But in case you found this book on your desk one Monday morning with a sticky note reading “Learn this!,” this chapter looks at the basics of PHP, MySQL, and Apache to show you what makes the “AMP” combination so popular.
I can't understand what does the sentence in bold want to say.
and what does in case mean?
i think it says u know the benefits but you have to read this chapter.