php $_SERVER['HTTP_USER_AGENT']

//获取浏览器function getBrowse(){    global $_SERVER;    $Agent = $_SERVER['HTTP_USER_AGENT'];    $browseinfo='';    if(ereg('Mozilla', $Agent) && !ereg('MSIE', $Agent)){        $browseinfo = 'Netscape Navigator';    }    if(ereg('Opera', $Agent)) {        $browseinfo = 'Opera';    }    if(ereg('Mozilla', $Agent) && ereg('MSIE', $Agent)){        $browseinfo = 'Internet Explorer';    }    if(ereg('Chrome', $Agent)){        $browseinfo="Chrome";    }    if(ereg('Safari', $Agent)){        $browseinfo="Safari";    }    if(ereg('Firefox', $Agent)){        $browseinfo="Firefox";    }    return $browseinfo;}//获取ipfunction getIP (){    global $_SERVER;    if (getenv('HTTP_CLIENT_IP')) {        $ip = getenv('HTTP_CLIENT_IP');    } else if (getenv('HTTP_X_FORWARDED_FOR')) {        $ip = getenv('HTTP_X_FORWARDED_FOR');    } else if (getenv('REMOTE_ADDR')) {        $ip = getenv('REMOTE_ADDR');    } else {        $ip = $_SERVER['REMOTE_ADDR'];    }    return $ip;}//获取用户系统function getOS (){    global $_SERVER;    $agent = $_SERVER['HTTP_USER_AGENT'];    $os = false;    if (eregi('win', $agent) && strpos($agent, '95')){        $os = 'Windows 95';    }elseif (eregi('win 9x', $agent) && strpos($agent, '4.90')){        $os = 'Windows ME';    }elseif (eregi('win', $agent) && ereg('98', $agent)){        $os = 'Windows 98';    }elseif (eregi('win', $agent) && eregi('nt 5.1', $agent)){        $os = 'Windows XP';    }elseif (eregi('win', $agent) && eregi('nt 5.2', $agent)){            $os = 'Windows 2003';    }elseif (eregi('win', $agent) && eregi('nt 5', $agent)){        $os = 'Windows 2000';    }elseif (eregi('win', $agent) && eregi('nt', $agent)){        $os = 'Windows NT';    }elseif (eregi('win', $agent) && ereg('32', $agent)){        $os = 'Windows 32';    }elseif (eregi('linux', $agent)){        $os = 'Linux';    }elseif (eregi('unix', $agent)){        $os = 'Unix';    }elseif (eregi('sun', $agent) && eregi('os', $agent)){        $os = 'SunOS';    }elseif (eregi('ibm', $agent) && eregi('os', $agent)){        $os = 'IBM OS/2';    }elseif (eregi('Mac', $agent) && eregi('PC', $agent)){        $os = 'Macintosh';    }elseif (eregi('PowerPC', $agent)){        $os = 'PowerPC';    }elseif (eregi('AIX', $agent)){        $os = 'AIX';    }elseif (eregi('HPUX', $agent)){        $os = 'HPUX';    }elseif (eregi('NetBSD', $agent)){        $os = 'NetBSD';    }elseif (eregi('BSD', $agent)){        $os = 'BSD';    }elseif (ereg('OSF1', $agent)){        $os = 'OSF1';    }elseif (ereg('IRIX', $agent)){        $os = 'IRIX';    }elseif (eregi('FreeBSD', $agent)){        $os = 'FreeBSD';    }elseif (eregi('teleport', $agent)){        $os = 'teleport';    }elseif (eregi('flashget', $agent)){        $os = 'flashget';    }elseif (eregi('webzip', $agent)){        $os = 'webzip';    }elseif (eregi('offline', $agent)){        $os = 'offline';    }else{        $os = 'Unknown';    }    return $os;}