RE: [PHP] How can obtain referer's name?

[Martin Towell]

if you have the globals setting in your ini file set to on then you can
use: $HTTP_REFERER
otherwise, I think, it's found in $_SERVER[HTTP_REFERER] - just check for
something like that in phpinfo();

-Original Message-
From: Alex Shi [mailto:[EMAIL PROTECTED]]
Sent: Monday, May 13, 2002 10:48 AM
To: [EMAIL PROTECTED]
Subject: [PHP] How can obtain referer's name?


Hi!

I want to know how can a script obtain the page name where 
it was linked. e.g., there's a link on page.html, and the link 
points to script.php, how can script.php know the name of
page.html? Thanks in advance for all answer!

Alex

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RE: [PHP] How can obtain referer's name?

[Richard Archer]

At 10:49 AM +1000 13/5/02, Martin Towell wrote:
if you have the globals setting in your ini file set to on then you can
use: $HTTP_REFERER

Watch out though... the HTTP_REFERER data is provided by the user
and cannot be trusted. It can't even be guaranteed to exist.

If all the pages are on the same site, you could embed the form
filename in a hidden field on the form so it is passed to the script.

Or since that's also open to abuse by malicious users, you could
track where the user is in the site using session variables.

 ...R.

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RE: [PHP] How can obtain referer's name?

[Philip Olson]

 if you have the globals setting in your ini file set to on 
 then you can use: $HTTP_REFERER otherwise, I think, it's found 
 in $_SERVER[HTTP_REFERER] - just check for something like 
 that in phpinfo();

Just to be picky, predefined reserved server variables will 
always exist in both $HTTP_SERVER_VARS and $_SERVER.  So, 
everyone could go through one of these predefined variables 
regardless of the register_globals value.

Of course HTTP_REFERER may or may not exist.  And $_SERVER 
became available in PHP 4.1.0.  $HTTP_SERVER_VARS has been 
around since the 90's :)

A related faqt on HTTP_REFERER in PHP can be seen here:

  Why does $HTTP_REFERER return an empty string?
  http://www.faqts.com/knowledge_base/view.phtml/aid/31

So regarding the question, do something like so 
in script.php

  print $_SERVER['HTTP_REFERER'];
  print $HTTP_SERVER_VARS['HTTP_REFERER'];

Personally I love registering server vars in the 
scope and many times will do this (on top of the 
script):

  if (!ini_get('register_globals')) {
  extract($HTTP_SERVER_VARS);
  }

In this case, it's safe to use $HTTP_REFERER even if 
register_globals = off as it will then be created.

See also:
  http://www.php.net/manual/en/language.variables.predefined.php

Regards,
Philip Olson


 -Original Message-
 From: Alex Shi [mailto:[EMAIL PROTECTED]]
 Sent: Monday, May 13, 2002 10:48 AM
 To: [EMAIL PROTECTED]
 Subject: [PHP] How can obtain referer's name?
 
 
 Hi!
 
 I want to know how can a script obtain the page name where 
 it was linked. e.g., there's a link on page.html, and the link 
 points to script.php, how can script.php know the name of
 page.html? Thanks in advance for all answer!
 
 Alex
 
 -- 
 PHP General Mailing List (http://www.php.net/)
 To unsubscribe, visit: http://www.php.net/unsub.php
 
 -- 
 PHP General Mailing List (http://www.php.net/)
 To unsubscribe, visit: http://www.php.net/unsub.php
 


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