Browser Detector

<?php
/******************************************
** Description   : BrowserDetector
** Version       : 1.0.6
** File Name     : browserDetector.php
** Author        : epsilon7 for PHyX8 studios
** Author Email  : [email protected]
** Created       : Thursday, May 11, 2000
** Last Modified : Thursday, April 20, 2006
** Modified By   : SecondV

INFO: Returns Browser information based on HTTP_USER_AGENT

Based on The Webmonkey JavaScript Source
##BrowserDetector()
##Parses User-Agent string into useful info.
##Source: Webmonkey Code Library
##(http://www.hotwired.com/webmonkey/javascript/code_library/)
##Author: Rich Blaylock
##Author Email: [email protected]

## CHANGE LOG

++Thursday, April 20, 2006
  Code cleanup is about it, not sure if this even works anymore.
  Will take another look later and see if it's worth..or needed..to rewrite
  it.
  
++Thursday, August 17, 2000
  Modified to recognize Netscape 6 Preview Releases

++Friday, August 4, 2000
  Modified to properly recognize iCab, an alernative browser for Macintosh
  (modified by suzerain -- http://www.suzerain.com/)

++Friday, July 28, 2000
  Opera browsers below version 4.0 should now be successfully detected.

++Thursday, July 20, 2000
  Replaced preg_match() with eregi()

++Wednesday, July 12, 2000
  Fixed PHP4 Bug

   Usage:
   include("browserDetector.php");
   $bd = new BrowserDetector;

   Variables:
   $bd->BROWSER         // Netscape, MSIE, Opera
   $bd->PLATFORM        // Win,Mac,Unix
   $bd->VERSION         // MajorVersion.MinorVersion
   $bd->MAJORVER        // Major Version (before . in version string)
   $bd->MINORVER        // Minor Version (after . in version string)

 '****************************************/
class BrowserDetector
{
  var $ua =  '';
  var $browser = 'Unknown';
  var $plateform = 'Unknown';
  var $version = '';
  var $majorver = '';
  var $minorver = '';

  /* START CONSTRUCTOR */

  function BrowserDetector()
  {
    $this->ua = $_SERVER['HTTP_USER_AGENT'];
    $preparens = '';
    $parens = '';
    $postparens = '';
    $i = strpos($this->ua, '(');

    if($i >= 0)
    {
      $preparens = trim(substr($this->ua, 0, $i));
      $parensTMP = substr($this->ua, $i + 1, strlen($this->ua));
      $j = strpos($parensTMP, ')');

      if($j >= 0)
      {
        $parens = substr($parensTMP, 0, $j);
        $postparens = trim(substr($parensTMP, $j + 1, strlen($parensTMP)));
      }
    }
    else
    {
      $preparens = $this->ua;
    }
    $browVer = $preparens;
    $token = trim(strtok($parens, ';'));

    while($token)
    {
      if($token == 'compatible')
      {
        //
      }
      elseif(eregi('MSIE', $token))
      {
        $browVer = $token;
      }
      elseif(eregi('Opera', $token))
      {
        $browVer = $token;
      }
      elseif(eregi('X11', $token) || eregi('SunOS', $token) || eregi('Linux', $token))
      {
        $this->platform = 'Unix';
      }
      elseif(eregi('Win', $token))
      {
        $this->platform = $token;
      }
      elseif(eregi('Mac', $token) || eregi('PPC', $token))
      {
        $this->platform = $token;
      }
      $token = strtok(';');
    }
    $msieIndex = strpos($browVer, 'MSIE');

    if($msieIndex >= 0)
    {
      $browVer = substr($browVer, $msieIndex, strlen($browVer));
    }
    $leftover = '';

    if(substr($browVer, 0, strlen('Mozilla')) == 'Mozilla')
    {
      $this->browser = 'Netscape';
      $leftover = substr($browVer, strlen('Mozilla') + 1, strlen($browVer));
    }
    elseif(substr($browVer, 0, strlen('Lynx')) == 'Lynx')
    {
      $this->browser = 'Lynx';
      $leftover = substr($browVer, strlen('Lynx') + 1, strlen($browVer));
    }
    elseif(substr($browVer, 0, strlen('MSIE')) == 'MSIE')
    {
      $this->browser = 'IE';
      $leftover = substr($browVer, strlen('MSIE') + 1, strlen($browVer));
    }
    elseif(substr($browVer, 0, strlen('Microsoft Internet Explorer')) == 'Microsoft Internet Explorer')
    {
      $this->browser = 'IE';
      $leftover = substr($browVer, strlen('Microsoft Internet Explorer') + 1, strlen($browVer));
    }
    elseif(substr($browVer, 0, strlen('Opera')) == 'Opera')
    {
      $this->browser = 'Opera';
      $leftover = substr($browVer, strlen('Opera') + 1, strlen($browVer));
    }
    elseif(substr($browVer, 0, strlen('iCab')) == 'iCab')
    {
      $this->browser = 'iCab';
      $leftover = substr($browVer, strlen('iCab') + 1, strlen($browVer));
    }
    $leftover = trim($leftover);

    /* CHECK FOR OPERA BROWSERS BELOW VERSION 4.0 */
    if(!empty($postparens))
    {
      if(substr($postparens, 0, strlen('Opera')) == 'Opera')
      {
        $this->browser = 'Opera';
        $v = trim(substr($postparens, strlen('Opera') + 1, strlen($postparens)));
        $v = trim(substr($v, 0, strpos($v, ' ')));
        $leftover = $v;
      }
    }

    /* CHECK FOR NETSCAPE 6 PREVIEW RELEASES */
    if(!empty($postparens))
    {
      if(eregi('Netscape6', $postparens))
      {
        $this->browser = 'Netscape';
        $i = strpos($postparens, 'Netscape6');

        if($i >= 0)
        {
          $v = trim(substr($postparens, $i + strlen('Netscape6') + 1, strlen($postparens)));
          $leftover = $v;
        }
      }
    }
    $i = strpos($leftover, ' ');

    if($i > 0)
    {
      $this->version = substr($leftover, 0, $i);
    }
    else
    {
      $this->version = $leftover;
    }

    $j = strpos($this->version, '.');

    if($j >= 0)
    {
      $this->majorver = substr($this->version, 0, $j);
      $this->minorver = substr($this->version, $j + 1, strlen($this->version));
    }
    else
    {
      $this->majorver = $this->version;
    }
  }
}
?>