Swift_Signers_DKIMSigner::setHeaders PHP Method

    public function setHeaders(Swift_Mime_HeaderSet $headers)
    {
        $this->headerCanonData = '';
        // Loop through Headers
        $listHeaders = $headers->listAll();
        foreach ($listHeaders as $hName) {
            // Check if we need to ignore Header
            if (!isset($this->ignoredHeaders[strtolower($hName)])) {
                if ($headers->has($hName)) {
                    $tmp = $headers->getAll($hName);
                    foreach ($tmp as $header) {
                        if ($header->getFieldBody() != '') {
                            $this->addHeader($header->toString());
                            $this->signedHeaders[] = $header->getFieldName();
                        }
                    }
                }
            }
        }
        return $this;
    }

 public function setHeaders(Swift_Mime_HeaderSet $headers)
 {
     if (!$this->_peclLoaded) {
         return parent::setHeaders($headers);
     }
     //dkim_sign(privateKey, selector, domain[, header_canon[, body_canon[, sign_alg[, body_length]]]])
     $bodyLen = $this->_bodyLen();
     if (is_bool($bodyLen)) {
         $bodyLen = -1;
     }
     $hash = $this->_hashAlgorithm == 'rsa-sha1' ? DKIM_SIGN_RSASHA1 : DKIM_SIGN_RSASHA256;
     $bodyCanon = $this->_bodyCanon == 'simple' ? DKIM_CANON_SIMPLE : DKIM_CANON_RELAXED;
     $headerCanon = $this->_headerCanon == 'simple' ? DKIM_CANON_SIMPLE : DKIM_CANON_RELAXED;
     $this->_dkimHandler = dkim_sign($this->_privateKey, $this->_selector, $this->_domainName, $headerCanon, $bodyCanon, $hash, $bodyLen);
     $listHeaders = $headers->listAll();
     foreach ($listHeaders as $hName) {
         // Check if we need to ignore Header
         if (!isset($this->_ignoredHeaders[strtolower($hName)])) {
             $tmp = $headers->getAll($hName);
             if ($headers->has($hName)) {
                 foreach ($tmp as $header) {
                     if ($header->getFieldBody() != '') {
                         dkim_header($this->_dkimHandler, $header->toString());
                         $this->_signedHeaders[] = $header->getFieldName();
                     }
                 }
             }
         }
     }
     return $this;
 }