Cómo obtener el nombre de la página anterior en PHP
basename($_SERVER['HTTP_REFERER']);
Cute Copperhead
basename($_SERVER['HTTP_REFERER']);//This should be on the previous page
session_start();
$_SESSION["url"] = "the_url_of_page_we_want_to_get_back.php";
//This should be on the current executing page
session_start();
$previous_page_url = $_SESSION["url"];