Basic Php Browser Sniffer

[mitten]

Hello there!

 

I'm trying to run a very simple 'browser sniffer' so I can serve a different CSS sheet to IE/Mac users. However, I can't for the life of me get a proper return from this:

 

>$fullbrowser = ($_SERVER["HTTP_USER_AGENT"]);

 

It doesn't return any data at all, no matter which browser I'm using (checking with Firefox, IE and IE/Mac). I printed out the whole $_SERVER array, and sure enough - there's no user agent in there.

 

>Array
(
   [DOCUMENT_ROOT] => /home/dqzhlhsq/public_html
   [HTTP_HOST] => martinirepublic.com
   [PATH] => /sbin:/usr/sbin:/bin:/usr/bin:/usr/X11R6/bin
   [REMOTE_ADDR] => 209.51.137.10
   [REMOTE_PORT] => 51342
   [SCRIPT_FILENAME] => /home/dqzhlhsq/public_html/browsermac.php
   [SERVER_ADDR] => 209.51.137.10
   [SERVER_ADMIN] => webmaster@martinirepublic.com
   [SERVER_NAME] => www.martinirepublic.com
   [SERVER_PORT] => 80
   [SERVER_SIGNATURE] => <ADDRESS>Apache/1.3.31 Server at www.martinirepublic.com Port 80</ADDRESS>

   [SERVER_SOFTWARE] => Apache/1.3.31 (Unix) mod_auth_passthrough/1.8 mod_log_bytes/1.2 mod_bwlimited/1.4 PHP/4.3.7 FrontPage/5.0.2.2634a mod_ssl/2.8.18 OpenSSL/0.9.7a
   [GATEWAY_INTERFACE] => CGI/1.1
   [SERVER_PROTOCOL] => HTTP/1.0
   [REQUEST_METHOD] => GET
   [QUERY_STRING] => 
   [REQUEST_URI] => /browsermac.php
   [SCRIPT_NAME] => /browsermac.php
   [PATH_TRANSLATED] => /home/dqzhlhsq/public_html/browsermac.php
   [PHP_SELF] => /browsermac.php
   [argv] => Array
       (
       )

 

Why is there no user agent listed? Since I'm getting the same non-return everywhere (checking from two different machines) I'm assuming this is a server thing. Is there another way to get the $HTTP_USER_AGENT string?

 

It's to be used in a super simple script:

 

><?php

$fullbrowser = $_SERVER["HTTP_USER_AGENT"];

$agent = strpos($fullbrowser,'Mac');

if ($agent === false)
 $browser = 'mac';
else
 $browser = 'other';

if ($browser == 'mac')
echo ('<link rel="stylesheet" type="text/css" href="MRmac.css" />'); 
else
echo ('<link rel="stylesheet" type="text/css" href="MR.css" />');

?>

 

Thanks for the help!

[mitten]

I can see that the variable HTTP_USER_AGENT does have data in it:

 

http://martinirepublic.com/phpinfo.php

 

So why doesn't it show in the $_SERVER array?

 

 

 

I also thought to use get_browser(), but it can't find the browscap.ini file.

 

 

Is this something I can get help with from TCH Tech Support?

[mitten]

Ahhh - continued detective work: the problem lies elsewhere. I'm including this file from within a CMS program and that is messing up the variables somehow. So, nevermind - off to another support forum now!

[TCH-Don]

Hmmm, I am starting to worry,

more and more people here are talking to themselfs

 

 

Seriously, it sometimes helps to layout a problem for others to see

and then you can also see it with fresh eyes.

 

Are the variables you picked,

being also used in your CMS somewhere?