public static function checkRegistration()
{
$rules = ['email' => FILTER_SANITIZE_SPECIAL_CHARS, 'key' => FILTER_SANITIZE_STRING];
$data = filter_input_array(INPUT_GET, $rules);
$mail = urldecode($data['email']);
$activation_key = urldecode($data['key']);
return Activation::checkActivationCode($mail, $activation_key);
}
