yii\httpclient\Client::getFormatter PHP Method

    public function getFormatter($format)
    {
        static $defaultFormatters = [self::FORMAT_JSON => 'yii\\httpclient\\JsonFormatter', self::FORMAT_URLENCODED => ['class' => 'yii\\httpclient\\UrlEncodedFormatter', 'encodingType' => PHP_QUERY_RFC1738], self::FORMAT_RAW_URLENCODED => ['class' => 'yii\\httpclient\\UrlEncodedFormatter', 'encodingType' => PHP_QUERY_RFC3986], self::FORMAT_XML => 'yii\\httpclient\\XmlFormatter'];
        if (!isset($this->formatters[$format])) {
            if (!isset($defaultFormatters[$format])) {
                throw new InvalidParamException("Unrecognized format '{$format}'");
            }
            $this->formatters[$format] = $defaultFormatters[$format];
        }
        if (!is_object($this->formatters[$format])) {
            $this->formatters[$format] = Yii::createObject($this->formatters[$format]);
        }
        return $this->formatters[$format];
    }