PHP - Code Not Work

I have the following code is a included file on my main page

Code: [Select]

class usersOnline {

var $timeout = 600;
var $count = 0;
var $error;
var $i = 0;

function usersOnline () {
$this->timestamp = time();
$this->ip = $this->ipCheck();
$this->new_user();
$this->delete_user();
$this->count_users();
$this->browser = $this->useragentbrowser();
$this->os = $this->useragentos();
}


// start user
function useragentbrowser(){

$agent = getenv('HTTP_USER_AGENT');
$browserArray = array(
        'Windows Mobile' => 'IEMobile',
'Android Mobile' => 'Android',
'iPhone Mobile' => 'iPhone',
'Firefox' => 'Firefox',
        'Google Chrome' => 'Chrome',
        'Internet Explorer' => 'MSIE',
        'Opera' => 'Opera',
        'Safari' => 'Safari'
);
foreach ($browserArray as $k => $v) {

    if (preg_match("/$v/", $agent)) {
         break;
    } else {
$k = "Browser Unknown";
    }
}
$browser = $k;
return $browser;

}

function useragentos(){
$agent = getenv('HTTP_USER_AGENT');
$osArray = array(
        'Windows 98' => '(Win98)|(Windows 98)',
        'Windows 2000' => '(Windows 2000)|(Windows NT 5.0)',
'Windows ME' => 'Windows ME',
        'Windows XP' => '(Windows XP)|(Windows NT 5.1)',
        'Windows Vista' => 'Windows NT 6.0',
        'Windows 7' => '(Windows NT 6.1)|(Windows NT 7.0)',
        'Windows NT 4.0' => '(WinNT)|(Windows NT 4.0)|(WinNT4.0)|(Windows NT)',
'Linux' => '(X11)|(Linux)',
'Mac OS' => '(Mac_PowerPC)|(Macintosh)|(Mac OS)'
);
foreach ($osArray as $k => $v) {

    if (preg_match("/$v/", $agent)) {
         break;
    } else {
$k = "Unknown OS";
    }
}
$os = $k;

return $os;

}



// end user


function ipCheck() {

if (getenv('HTTP_CLIENT_IP')) {
$ip = getenv('HTTP_CLIENT_IP');
}
elseif (getenv('HTTP_X_FORWARDED_FOR')) {
$ip = getenv('HTTP_X_FORWARDED_FOR');
}
elseif (getenv('HTTP_X_FORWARDED')) {
$ip = getenv('HTTP_X_FORWARDED');
}
elseif (getenv('HTTP_FORWARDED_FOR')) {
$ip = getenv('HTTP_FORWARDED_FOR');
}
elseif (getenv('HTTP_FORWARDED')) {
$ip = getenv('HTTP_FORWARDED');
}
else {
$ip = $_SERVER['REMOTE_ADDR'];
}
return $ip;
}

function new_user() {
$insert = mysql_query ("INSERT INTO ******(timestamp, ip, browser, os) VALUES ('$this->timestamp', '$this->ip', '$this->browser', '$this->os')");
if (!$insert) {
$this->error[$this->i] = "Unable to record new visitor\r\n";
$this->i ++;
}
}

function delete_user() {
$delete = mysql_query ("DELETE FROM ***** WHERE timestamp < ($this->timestamp - $this->timeout)");
if (!$delete) {
$this->error[$this->i] = "Unable to delete visitors";
$this->i ++;
}
}

function count_users() {
if (count($this->error) == 0) {
$count = mysql_num_rows ( mysql_query("SELECT DISTINCT ip FROM *******"));
return $count;
}
}

}


The problem I have is that $browser and $os are not being inserted into the db, but everything else is.

Can anyone help?

Thanks James