statics on visitors' OS and browser

[Anon]

Most webmasters are interested in visitor's operating systems and browers. I made the following code snippet:

$http_user_agent = getenv("HTTP_USER_AGENT");
// MSIE 6.0
if ( ereg("(MSIE [a-zA-Z0-9.]+)" , $http_user_agent, $arrayRE) ) { $browser = $arrayRE[1];
// Netscape6/6.1
} elseif ( ereg("(Netscape[/a-zA-Z0-9.]+)", $http_user_agent, $arrayRE) ) { $browser = $arrayRE[1];
// Opera/5.12
} elseif ( ereg("(Opera/[0-9.]+)" , $http_user_agent, $arrayRE) ) { $browser = $arrayRE[1];
} // end of if ( ereg("(MSIE [a-zA-Z0-9.]+)" , $http_user_agent, $arrayRE) )

// Windows 98
if ( ereg("(Windows [0-9.]+)" , $http_user_agent, $arrayRE) ) { $os = $arrayRE[1];
// Windows NT 5.1
} elseif ( ereg("(Windows NT( [0-9.]+)?)" , $http_user_agent, $arrayRE) ) { $os = $arrayRE[1];
// WinNT
} elseif ( ereg("(WinNT)" , $http_user_agent, $arrayRE) ) { $os = $arrayRE[1];
// Win98
} elseif ( ereg("(Win[0-9.]+)" , $http_user_agent, $arrayRE) ) { $os = $arrayRE[1];
// Linux 2.4.2-2 i686
} elseif ( ereg("(Linux [-0-9.]+ i[0-9]+)" , $http_user_agent, $arrayRE) ) { $os = $arrayRE[1];
// Mac_PowerPC
} elseif ( ereg("(Mac_PowerPC)" , $http_user_agent, $arrayRE) ) { $os = $arrayRE[1];
// Macintosh
} elseif ( ereg("(Macintosh)" , $http_user_agent, $arrayRE) ) { $os = $arrayRE[1];
// SunOS 5.7
} elseif ( ereg("(SunOS [0-9.]+)" , $http_user_agent, $arrayRE) ) { $os = $arrayRE[1];
} // end of if ( ereg("(Windows [0-9.]+)" , $http_user_agent, $arrayRE) )
if($browser=="MSIE 5.00") $browser="MSIE 5.0";
if($browser=="MSIE 5.50") $browser="MSIE 5.5";
if($os=="Win98") $os="Windows 98";
if($os=="Win95") $os="Windows 95";
if($os=="WinNT") $os="Windows NT";

• The above snippet must be imperfect. Is there anybody who can help me with that?

[Anon]

No. Web Browser percent count
1 MSIE 6.0 37.9% 198
2 MSIE 5.5 25.5% 133
3 - Robots and Unknowns - 16.1% 84
4 MSIE 5.0 10.9% 57
5 MSIE 5.01 10.3% 54
6 MSIE 6.0b 1% 5
7 MSIE 4.01 1% 5
8 Netscape6/6.2 0.6% 3
9 Netscape6/6.2.2 0.4% 2
10 Opera/6.03 0.2% 1
11 MSIE 5.13 0.2% 1
12 MSIE 5.15 0.2% 1

No. Operating System percent count
1 Windows 98 45.6% 238
2 Windows NT 5.0 24.3% 127
3 - Robots and Unknowns - 13.8% 72
4 Windows NT 5.1 12.8% 67
5 Windows NT 2.3% 12
6 Windows 95 2.1% 11
7 Mac_PowerPC 1.3% 7
8 Windows NT 4.0 1.1% 6
9 Win32 0.4% 2
10 SunOS 5.7 0.2% 1
11 Macintosh 0.2% 1