Exercise 2: LAMP, Applied to a Running WordPress Site — Possible Solution
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L — LINUX
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Per this chapter, Linux is the operating system the server itself runs
on - the foundation everything else (Apache, MySQL, PHP) is installed
on top of. WordPress doesn't interact with Linux directly in any
special way; it simply needs a Linux server to actually run on.

A — APACHE
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Per this chapter, Apache (or Nginx) is what actually serves WordPress's
files to a visitor's browser - it's the piece that listens for an
incoming web request and hands it off to be processed, ultimately
returning the finished page.

M — MYSQL
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Per this chapter, "every post, page, comment, user, and setting is a
row in a MySQL database." One specific concrete example: every blog
post's own title and body text is stored as a row in a MySQL database
table - when a visitor requests that post, WordPress queries the
database for that specific row and uses its content to build the page.

P — PHP
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Per this chapter, "WordPress core, every theme, and every plugin is
PHP code, executed on each page request." PHP is the actual programming
language WordPress itself is written in - it's the code that runs on
the server, queries MySQL for the needed content, and assembles the
final HTML page that Apache then sends back to the visitor.

HOW THEY WORK TOGETHER
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On a real request: Apache (running on Linux) receives the request and
hands it to PHP; PHP code (WordPress itself) queries MySQL for the
specific post/page content needed; PHP then builds the final HTML page
using that data, which Apache sends back to the browser. All four
layers work together on every single page load.

WHY THIS WORKS AS AN ANSWER
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It defines each of the four LAMP layers specifically in terms of
WordPress's own use of it (not just a generic definition), gives a
concrete example of something stored in the "M" layer as the exercise
specifically asked, and shows how the four layers cooperate on one real
request rather than describing them only in isolation.