PHP class to obtain client information

/**
 * Classes for obtaining visitor information: language, browser, operating system, IP, geographical location, ISP.
 * Date: 2013/10/11
 * Editor: bbs.it-home.org
 * Use:
 $obj = new class_guest_info;
 $obj->GetLang(); //Get guest language: Simplified Chinese, Traditional Chinese, English.
 $obj->GetBrowser(); //Get the visitor's browser: MSIE, Firefox, Chrome, Safari, Opera, Other.
 $obj->GetOS(); //Get the guest operating system: Windows, MAC, Linux, Unix, BSD, Other.
 $obj->GetIP(); //Get the visitor IP address.
 $obj->GetAdd(); //Get the visitor's geographical location and use Baidu hidden interface.
 $obj->GetIsp(); //Get the guest ISP, use Baidu hidden interface.
*/
class class_guest_info{
 function GetLang() {
 $Lang = substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 4);
 // Use substr() to intercept the string, starting from 0, intercepting 4 characters
 if (preg_match('/zh-c/i',$Lang)) {
 //preg_match() regular expression matching function
 $Lang = 'Simplified Chinese';
 }
 elseif (preg_match('/zh/i',$Lang)) {
 $Lang = 'Traditional Chinese';
 }
 else {
 $Lang = 'English';
 }
 return $Lang;
 }
 function GetBrowser() {
 $Browser = $_SERVER['HTTP_USER_AGENT'];
 if (preg_match('/MSIE/i',$Browser)) {
 $Browser = 'MSIE';
 }
 elseif (preg_match('/Firefox/i',$Browser)) {
 $Browser = 'Firefox';
 }
 elseif (preg_match('/Chrome/i',$Browser)) {
 $Browser = ' Chrome';
 }
 elseif (preg_match('/Safari/i',$Browser)) {
 $Browser = 'Safari';
 }
 elseif (preg_match('/Opera/i',$Browser)) {
 $Browser = 'Opera';
 }
 else {
 $Browser = 'Other';
 }
 return $Browser;
 }
 function GetOS() {
 $OS = $_SERVER['HTTP_USER_AGENT'];
 if ( preg_match('/win/i',$OS)) {
 $OS = 'Windows';
 }
 elseif (preg_match('/mac/i',$OS)) {
 $OS = 'MAC';
 }
 elseif (preg_match('/linux/i',$OS)) {
 $OS = 'Linux';
 }
 elseif (preg_match('/unix/i',$OS)) {
 $OS = ' Unix';
 }
 elseif (preg_match('/bsd/i',$OS)) {
 $OS = 'BSD';
 }
 else {
 $OS = 'Other';
 }
 return $OS;
 }
 function GetIP() {
 if (!empty($_SERVER['HTTP_CLIENT_IP'])) {
 //If the variable is a non-empty or non-zero value, empty() returns FALSE.
 $IP = explode(',',$_SERVER['HTTP_CLIENT_IP']);
 }
 elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
 $IP = explode(',',$_SERVER[ 'HTTP_X_FORWARDED_FOR']);
 }
 elseif (!empty($_SERVER['REMOTE_ADDR'])) {
 $IP = explode(',',$_SERVER['REMOTE_ADDR']);
 }
 else {
 $ IP[0] = 'None';
 }
 return $IP[0];
 }
 private function GetAddIsp() {
 $IP = $this->GetIP();
 $AddIsp = mb_convert_encoding(file_get_contents(' http://open.baidu.com/ipsearch/s?tn=ipjson&wd='.$IP),'UTF-8','GBK');
 //mb_convert_encoding() Convert character encoding.
 if (preg_match('/noresult/i',$AddIsp)) {
 $AddIsp = 'None';
 }
 else {
 $Sta = stripos($AddIsp,$IP) + strlen($IP) + strlen ('from');
 $Len = stripos($AddIsp,'"}')-$Sta;
 $AddIsp = substr($AddIsp,$Sta,$Len);
 }
 $AddIsp = explode(' ' ,$AddIsp);
 return $AddIsp;
 }
 function GetAdd() {
 $Add = $this->GetAddIsp();
 return $Add[0];
 }
 function GetIsp() {
 $Isp = $this->GetAddIsp();
 if ($Isp[0] != 'None' && isset($Isp[1])) {
 $Isp = $Isp[1];
 }
 else {
 $Isp = 'None';
 }
 return $Isp;
 }
}
?>

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