function getOnlineIP() {
$cip = getenv ( 'HTTP_CLIENT_IP' );
$xip = getenv ( 'HTTP_X_FORWARDED_FOR' );
$rip = getenv ( 'REMOTE_ADDR' );
$srip = $_SERVER ['REMOTE_ADDR'];
if ($cip && strcasecmp ( $cip, 'unknown' )) {
$onlineip = $cip;
} elseif ($xip && strcasecmp ( $xip, 'unknown' )) {
$onlineip = $xip;
} elseif ($rip && strcasecmp ( $rip, 'unknown' )) {
$onlineip = $rip;
} elseif ($srip && strcasecmp ( $srip, 'unknown' )) {
$onlineip = $srip;
}
preg_match ( "/[\d\.]{7,15}/", $onlineip, $match );
$onlineip = $match [0] ? $match [0] : 'unknown';
return $onlineip;
}