protected function get_filter_value($filtername, $default = null) {
        if ($values = $this->get_filter_values($filtername)) {
            $value = reset($values);
            return $value;
        }
        return $default;
    }
protected function get_filter_value($filtername, $default = null) {
        if ($values = $this->get_filter_values($filtername)) {
            $value = reset($values);
            return $value;
        }
        return $default;
    }
protected function get_filter_value ( $ filtername , $ default = null ) { if ( $ values = $ this -> get_filter_values ( $ filtername ) ) { $ value = reset ( $ values ) ; return $ value ; } return $ default ; }
Get one value of the applied filter

@param string $filtername
@param string $default
@return mixed
Get one value of the applied filter