What is index.php used for?

Question

I'm trying to understand dynamic web pages. Can someone explain what index.php is used for?

My understanding is that based on Title or Content, the script within the file will issue a query to the database and generate the corresponding page.

Basically, is it a file that redirects the user upon request?

(I'm not sure if it's a duplicate, but I checked and couldn't find it)

Answer 1

Let’s break the answer into two parts:

1. What is a dynamic page?
2. What is Index.php and why is it called Index and what is it used for?

First, dynamic pages are pages that change with time, user or location, they are the opposite of static pages (such as examples of static pages: landing pages or resume pages).

Secondly, when you type "facebook.com" into the URL bar of your browser, you are accessing a very generic location, imagine opening the C drive on Windows and you will see Many folders displayed with different names, so we could not show the file structure of the web server to users who access the website, we wanted to solve this problem and let users access a specific location, so the developers decided to make a default one called "Index" Home page, another example is when you open a book, you first go to the index page to get an idea of ​​what each page is about and what to read. Generally speaking, any website (websitename.com) will automatically redirect you to the index file (websitename.com/index.php).

So the Facebook link should look like this:

[
• Homepage] facebook.com/index.php or facebook.com/home.php (if logged in)
[
• Login page] facebook.com/login.php