php获取客户端操作系统信息（类文件）

<?phpclass ClientGetObj{function getOS(){global $_SERVER;$agent=$_SERVER["HTTP_USER_AGENT"];$os=false;if(eregi("win",$agent)&&strpos($agent,"95")){$os="Windows 95";}else if(eregi("win 9x",$agent)&&strpos($agent,"4.90")){$os="Windows ME";}else if(eregi("win",$agent)&&eregi('98',$agent)){$os="Windows 98";}else if(eregi("win",$agent)&&eregi('nt 5.1',$agent)){$os="Windows XP";}else if(eregi("win",$agent)&&eregi('nt 5',$agent)){$os="Windows 2000";}else if(eregi("win",$agent)&&eregi('nt',$agent)){$os="Windows NT";}else if(eregi("win",$agent)&&eregi('32',$agent)){$os="Windows 32";}else if(eregi("linux",$agent)){$os="Linux";}else if(eregi("unix",$agent)){$os="Unix";}else if(eregi("sun",$agent)&&eregi("os",$agent)){$os="SunOS";}else if(eregi("ibm",$agent)&&eregi("os",$agent)){$os="IBM OS/2";}else if(eregi("mac",$agent)&&eregi("pc",$agent)){$os="Macintosh";}else if(eregi("powerpc",$agent)){$os="PowerPC";}else if(eregi("aix",$agent)){$os="AIX";}else if(eregi("HPUX",$agent)){$os="HPUX";}else if(eregi("netbsd",$agent)){$os="NetBSD";}else if(eregi("bsd",$agent)){$os="BSD";}else if(eregi("OSF1",$agent)){$os="OSF1";}else if(eregi("IRIX",$agent)){$os="IRIX";}else if(eregi("FreeBSD",$agent)){$os="FreeBSD";}else if(eregi("teleport",$agent)){$os="teleport";}else if(eregi("flashget",$agent)){$os="flashget";}else if(eregi("webzip",$agent)){$os="webzip";}else if(eregi("offline",$agent)){$os="offline";}else{$os="Unknown";}return $os;}}/*测试：$myos=new ClientGetObj;$result=$myos->getOS();echo "客户端操作系统为：".$result;*/?>