PHP - Reliability Of Http_accept_language For Browser Language Detection?

Hello,

I will tell you whant I want to do first and what I've done so far and hopefuly someone will be able to help.

What I hope for is to have one unique index.php that will work everywhere.  I don't mind if I have to modify each and add path where it is located since this won't happen often.

It needs to take car of preferred language and if someone land in a directory, I want it to load the index.php there.

I also look to not expose hidden URL in the browser URL box.  See *note 1 below.

My directory structure is as follow:

/index.php
/about/index.php
/blahblah/index.php

The current index.php I'm trying to build looks like this:

<?php
    if (preg_match('/^www.(.+)$/i', $_SERVER['HTTP_HOST'], $matches)) {
      header("Status: 301 Move permanently", false, 301);
      header('Location: http://'.$matches[1].$_SERVER['REQUEST_URI']);
      exit;
    }

    session_start();
    $Lang = $_SESSION['lang'];
    
    if (!isset($Lang))
         {
        if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE']))
            {
            $Lang = explode(",",$_SERVER['HTTP_ACCEPT_LANGUAGE']);
            $Lang = strtolower(substr(chop($Lang[0]),0,2));
            if ($Lang !== 'fr' && $Lang !== 'en')
                { 
                $Lang = "en";
                }
            }
        else
            {
      $Lang = "en";
            }
        $_SESSION['lang'] = $Lang;
        }

    include $_SERVER["DOCUMENT_ROOT"] . ("/index_" . $_SESSION['lang'] . ".php");
?>

First I remove "www." in the address when applies.  Not a must but I like that.

Then I check if Language is already set, if not I detect and set it for next pages.

I finally load the proper page according to language with an "include" so index_en.php remain secret (sort of).

*note 1: all my index_xx.php pages in every directory have this: Code: [Select]
<script language="javascript" type="text/javascript">
        if (self == top)
        top.location.href="directory/index.php";
    </script>

When in the root, it seems to work and I get the proper page but if I place this in /about/ then when I tried to load /about/index.php it doesn't work.  I think the include on the last line could be the problem.

I'm either close or far from it, I don't know.

Thank you.

I have done some searching and digging, but it seems everyone has their own ways of doing things, some more effective than others.

I have a web design portfolio website, which uses a "coinslider" flash slideshow. It looks awesome in FF, but IE6/etc users cant view it properly.

How can I create a PHP if/then to detect if they are using a sub-par browser, and display a more simple slideshow?

That way it will work for all users, and those with Firefox and similar browsers can view the more interesting slideshow.

Thanks.

Hello

Has anyone managed to create a php script that will detect and list the AddOns in a browser such as Firefox or Chrome?   I need to know if a user has a particular extension loaded and if it is disabled or enabled.

Paul

Here is my simple script for user browser and OS detection:
  $agent = $_SERVER['HTTP_USER_AGENT'];
  
  if (strstr($agent,"Windows")) {$os = "Windows";}
  if (strstr($agent,"Windows NT 6")) {$os = "Windows 7";}
  if (strstr($agent,"Linux")) {$os = "Linux";}
  if (strstr($agent,"Intel Mac OS X")) {$os = "OS X";}
  if (strstr($agent,"OpenBSD")) {$os = "BSD";}
  if (strstr($agent,"FreeBSD")) {$os = "FreeBSD";}
  
  if (strstr($agent,"Firefox/3")) {$br = "Firefox 3";}
  if (strstr($agent,"Firefox/2")) {$br = "Firefox 2";}
  if (strstr($agent,"Firefox/1")) {$br = "Firefox 1";}
  if (strstr($agent,"Phoenix/")) {$br = "Phoenix (Mozilla lite)";}
  if (strstr($agent,"MSIE 6")) {$br = "IE 6";}
  if (strstr($agent,"MSIE 7")) {$br = "IE 7";}
  if (strstr($agent,"MSIE 8")) {$br = "IE 8";}
  if (strstr($agent,"Netscape6/6")) {$br = "Netscape 6";}
  if (strstr($agent,"Opera")) {$br = "Opera";}
  if (strstr($agent,"Opera") and strstr($agent,"Version/10")) {$br = "Opera 10";}
  if (strstr($agent,"Opera") and strstr($agent,"Version/9")) {$br = "Opera 9";}
  if (strstr($agent,"Chrome") and strstr($agent,"Chrome/5")) {$br = "Chrome 5";}
  if (strstr($agent,"Safari/")) {$br = "Safari";}
  if (strstr($agent,"Safari/") and strstr($agent,"Version/5")) {$br = "Safari 5";}
  if (strstr($agent,"Safari/") and strstr($agent,"Version/4")) {$br = "Safari 4";}
  if (strstr($agent,"Safari/") and strstr($agent,"Version/3")) {$br = "Safari 3";}
  if (strstr($agent,"SeaMonkey/") and strstr($agent,"Gecko")) {$br = "SeaMonkey";}

  echo "Browser: <b>$br</b>, OS: <b>$os</b>";
I found some information from he http://www.zytrax.com/tech/web/browser_ids.htm

Is there any better solution for this, or script above is accurate?

Hi, I came across this code that detects a user's browser and I don't understand parts of it. Here is the code below.

Code: [Select]
$agent = $_SERVER['HTTP_USER_AGENT'];

if ( strpos(strtoupper($agent), 'MSIE')) {
print "Internet Explorer";
}
else if (strpos(strtoupper($agent), 'FIREFOX')) {
print "Firefox";
}
else if (strpos(strtoupper($agent), 'KONQUEROR')) {
print "Konqueror";
}
else if (strpos(strtoupper($agent), "LYNX")) {
print "Lynx";
}
else {
print $agent;
}
and here is the part I don't understand.

Code: [Select]
if ( strpos(strtoupper($agent), 'MSIE'))
I know that strtoupper makes all letters uppercase,
and that strpos returns the position of the string within
the larger string, but I don't know why they are in an if
statement.  Any help or explanation is greatly appreciated. Thanks. Derek