How to install and enable PHP 8.1 on Debian 11.3

PHP abbreviated as “HyperText Processor”, is the open-source programming language used for Web application development. It is a scripting language, mostly used for the front end with HTML. It can be used to create e-commerce websites, manage databases, and do session monitoring.
For more explanation on this video: https://www.linuxhelp.com/how-to-install-and-enable-php-8-1-on-debian-11-3