Redirecting to the referrer on form submission

Question

There are multiple pages. There are links on these pages. These links leads to a page with a form. When the form is submitted, the page that holds the form refreshes itself

Answer 1

What I like to do is add to a session variable array each time a page is accessed called "history", and only add to the array if the last $_SESSION['history'] item is not the current url (avoid multiple recent entries for page refresh, form validation failure, etc). Basically a breadcrumb trail of where the user has been. When you process the form - send the user back to whichever array value is most recent, excluding the current form's url if you please. Just make sure to set a default value in case there is no history.

$_SERVER['HTTP_REFERER'] can work sometimes, but Ive had major issues with it, and it doesn't work in a lot of cases (refresh, coming from same page, typing in the form url, coming from an email link, etc.) I strictly avoid it personally as it can lead to erratic behavior and redirect loops if you aren't careful with it. In fact I would just never use it for redirection.