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PHP, The Webprogramming Language
I have written a longer tutorial about installation of a LAMP stack.
You can find it here..

PHP (acronym for PHP: Hypertext Preprocessor) is a widely-used open source general-purpose scripting language that is especially suited for web development and can be embedded into HTML. The command for installing PHP can be;

sudo apt install php
The next example will make Apache communicate with MySQL.

sudo apt-get install php libapache2-mod-php php-mcrypt php-mysql