What is the use of learning php?

Question

what will it do to my skill

Answer 1

Just a short list of what PHP is capable of:
- Generating dynamic page content
- Creating, opening, reading, writing, deleting, and closing files on the server
- Collecting form data
- Adding, deleting, and modifying information stored in your database
- controlling user-access
- encrypting data
- and much more!
PHP has enough power to work at the core of WordPress, the busiest blogging system on the web. It also has the degree of depth required to run Facebook, the web's largest social network!
https://www.sololearn.com/learn/PHP/1801/

Answer 2

PHP runs on numerying varying platforms and it can run on Linux it's used to create sites it's best to use today like facebook it designed on PHP