canonicalizeHeader example

unset($headersToIgnore['from']);
        $signedHeaderNames = [];
        $headerCanonData = '';
        $headers = $message->getPreparedHeaders();
        foreach ($headers->getNames() as $name) {
            foreach ($headers->all($name) as $header) {
                if (isset($headersToIgnore[strtolower($header->getName())])) {
                    continue;
                }

                if ('' !== $header->getBodyAsString()) {
                    $headerCanonData .= $this->canonicalizeHeader($header->toString(), $options['header_canon']);
                    $signedHeaderNames[] = $header->getName();
                }
            }
        }

        [$bodyHash, $bodyLength] = $this->hashBody($message->getBody(), $options['body_canon'], $options['body_max_length']);

        $params = [
            'v' => '1',
            'q' => 'dns/txt',
            'a' => $options['algorithm'],
            

unset($headersToIgnore['from']);
        $signedHeaderNames = [];
        $headerCanonData = '';
        $headers = $message->getPreparedHeaders();
        foreach ($headers->getNames() as $name) {
            foreach ($headers->all($name) as $header) {
                if (isset($headersToIgnore[strtolower($header->getName())])) {
                    continue;
                }

                if ('' !== $header->getBodyAsString()) {
                    $headerCanonData .= $this->canonicalizeHeader($header->toString(), $options['header_canon']);
                    $signedHeaderNames[] = $header->getName();
                }
            }
        }

        [$bodyHash, $bodyLength] = $this->hashBody($message->getBody(), $options['body_canon'], $options['body_max_length']);

        $params = [
            'v' => '1',
            'q' => 'dns/txt',
            'a' => $options['algorithm'],