Like, if I want to display something like a HTML element, or execute some javascript I want to know how to like, only have it execute to where once a visitor arrives to my website, it'll only execute once a day/hour/30 mins for that visitor since I don't want to say... execute some JS for a popover for every page that user goes to & overburdening them to leave. So any help in this matter of doing this via PHP server function would be greatly appreciated
Set a cookie. The easiest way would be to set a cookie with an expiry time, and when they visit your site without the cookie show the popup. Not the best way, but the easiest way.