Php session return to previous page?

Question

PHP

Good afternoon. There is an array stored in the session. On the page, using ajax requests, we change some elements of this array. We go to any other page, go back using the "back" button in the browser, the value of the array remains what it was before the update by ajax requests. If you reload the page or go to it not using the "back" button, then everything is fine. What is the problem and how to fix it?

Answer 1

store the array in localStorage, not in the session

Answer 2

It's not a problem, it's the browser that caches the data.