Embedly\Embedly::url_encode PHP Method

    public static function url_encode($key, $value)
    {
        $key = urlencode($key);
        if (is_array($value)) {
            $value = implode(',', array_map('urlencode', $value));
        } else {
            $value = urlencode($value);
        }
        return sprintf("%s=%s", $key, $value);
    }