Introduction to PHP

In this tutorial, we will learn an introduction to PHP. PHP stands for Hypertext preprocessor and it is a well-known language to develop a web application. In a short definition, PHP is a server-side, open-source technology used to develop web applications ( Web applications help us process data on the server side and generate dynamic web pages for clients ). PHP is developed by Rasmus Lerdorf in 1994.

Difference between Client-side and server-side scripting language: –

You might have heard many times client-side or server-side scripting languages. But do you know the difference between client-side and server-side scripting languages?

  • The main difference between client-side and server-side scripting languages is that Server Side Scripting languages need a server to run meaning we can not run this kind of language directly on the client machine. On the other side, client-side scripting can work on the client machine.
  • Moreover, End-user can not see server-side code because the whole code only stays on the server. Server-side code will process user requests and send only result back to the user. But the end-user can see client-side scripting code. Because client-side scripting code works on the client machine.

We can not run code written in PHP directly on our PC. So it means we need a server to run code written in PHP. Do not worry I am not gonna tell you to buy a server. We have another option we can create a virtual server on a PC. There is a lot of free software in the market that allows us to create a virtual server on our PC. 

Currently Supported Versions of PHP:

Version Release Date Supported until
7.0 3 December 2015 10 January 2019
7.1 1 December 2016 1 December 2019
7.2 30 November 2017 30 November 2020
7.3 6 December 2018 6 December 2021
7.4 28 November 2019 28 November 2022
8.0 26 November 2020 26 November 2023
8.1 25 November 2021 25 November 2024
8.2 8 December 2022 8 December 2025
8.3 23 November 2023 23 November 2026

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