Determining Referer in PHP

Question

What is the most reliable and secure way to determine what page either sent, or called (via AJAX), the current page. I don\'t want to use the $_SERVER[\'HTTP_REFERER

Answer 1

There is no reliable way to check this. It's really under client's hand to tell you where it came from. You could imagine to use cookie or sessions informations put only on some pages of your website, but doing so your would break user experience with bookmarks.