How to save actions on page refresh?

Question

PHP

Look, for example, I have a function to change the background of the site when I click on the button! And I need this function to remain when the page is updated! that is, when you refresh the page, the last actions remained unchanged! (I hope I explained clearly)

Answer 1

You can save values ​​either to the server or to localStorage
P.S. It is also possible in cookies, but it will not be convenient to store.