php - save the referring site's url

I’d like to save the referring page to my site – only external sources and then pass it in a session to another page where I log this url.
My site uses the index.php file to connect to all pages of the site (like a global include). So my problem is that I do record the referring url, but it is erased if a user passes from page to page – my script writes the previous page, instead of just saving the entrance url and that’s it.

Anyone can help here?

 

hi
put this in index.php


session_start();

// Make sure the REFERER value is

if(strstr($_SESSION['HTTP_REFERER'], "index.php") == false)
{
// Save the value in the $_SESSION array
$_SESSION['origionalref'] = $_SERVER['HTTP_REFERER'];
}

 

I also need this guide again please help me how?

 

The variable is $_SERVER['HTTP_REFERER'];

However, there's no way to reliably do this. The referrer is not set on all browsers and can be forged. It is not a reliable method of identifying where a visitor came from. If the referrer can be used for anything that could be a potential security or operational risk, expect it to happen at some point.

 

Just to let you know people can manipluate HTTP referals so make sure to sanatize your strings.