static function getInstance($beacon)
{
// get the current visitor cookie
if (!isset($_COOKIE[self::$cookieName])) {
$vId = uniqid(self::$cookieName . '.');
self::$firstVisit = true;
} else {
$vId = $_COOKIE[self::$cookieName];
self::$firstVisit = false;
}
$beacon = json_decode($beacon, true);
$instance = new self($beacon, $vId);
if (self::$firstVisit) {
// save the user cookie id
setcookie(self::$cookieName, $vId, time() + self::$sessionDuration, '/', $instance->getDomainName());
}
return $instance;
}
