Open PHP page only loaded from other php

[carnt]

Hi ,

How can i force one PHP Page to open(start) only when we came from another PHP ?

Like :

(Page 1)-Acess first (Redirect to page2)
|---------(Page 2)(If came from page 1 Ok) / (If not came from page 1 or try to load this first then ERROR).

Can someone help ?

Thanks .

Carlos.

[Anon]

If you're running Apache, you can check the referring url with the predefined variable $HTTP_REFERER.

So:

if ($HTTP_REFERER != 'other_php_page')
die("error!");