PHP Page reload, how to add number of reloads to variable?

Question

PHP

Hello everyone, after 5 page updates, you need to display a message that you tell me. I found that header("refresh: 3;"); but this is every refrech: second;. Then window.location.reload(). I drive in the search gives me js. Where to read

Answer 1

https://yandex.ru/search/?text=setinterval%20javascript

var countRefresh = 0;
    setInterval(function() {
        countRefresh++;
        if (countRefresh == 5) {
            alert('your msg');
            countRefresh = 0;
        }
    }, 5000);