Illuminate\Routing\UrlGenerator::getRouteQueryString PHP Method

    protected function getRouteQueryString(array $parameters)
    {
        // First we will get all of the string parameters that are remaining after we
        // have replaced the route wildcards. We'll then build a query string from
        // these string parameters then use it as a starting point for the rest.
        if (count($parameters) == 0) {
            return '';
        }
        $query = http_build_query($keyed = $this->getStringParameters($parameters));
        // Lastly, if there are still parameters remaining, we will fetch the numeric
        // parameters that are in the array and add them to the query string or we
        // will make the initial query string if it wasn't started with strings.
        if (count($keyed) < count($parameters)) {
            $query .= '&' . implode('&', $this->getNumericParameters($parameters));
        }
        return '?' . trim($query, '&');
    }