mime.php

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    /**
     * Adds a multipart/alternative part to a mimePart
     * object (or creates one), and returns it during
     * the build process.
     *
     * @param  mixed   The object to add the part to, or
     *                 null if a new object is to be created.
     * @return object  The multipart/mixed mimePart object
     * @access private
     */
    function &_addAlternativePart(&$obj)
    {
        $params['content_type'] = 'multipart/alternative';
        if (is_object($obj)) {
            return $obj->addSubpart('', $params);
        } else {
            return new Mail_mimePart('', $params);
        }
    }

    /**
     * Adds a multipart/related part to a mimePart
     * object (or creates one), and returns it during
     * the build process.
     *
     * @param mixed    The object to add the part to, or
     *                 null if a new object is to be created
     * @return object  The multipart/mixed mimePart object
     * @access private
     */
    function &_addRelatedPart(&$obj)
    {
        $params['content_type'] = 'multipart/related';
        if (is_object($obj)) {
            return $obj->addSubpart('', $params);
        } else {
            return new Mail_mimePart('', $params);
        }
    }

    /**
     * Adds an html image subpart to a mimePart object
     * and returns it during the build process.
     *
     * @param  object  The mimePart to add the image to
     * @param  array   The image information
     * @return object  The image mimePart object
     * @access private
     */
    function &_addHtmlImagePart(&$obj, $value)
    {
        $params['content_type'] = $value['c_type'];
        $params['encoding']     = 'base64';
        $params['disposition']  = 'inline';
        $params['dfilename']    = $value['name'];
        $params['cid']          = $value['cid'];
        $obj->addSubpart($value['body'], $params);
    }

    /**
     * Adds an attachment subpart to a mimePart object
     * and returns it during the build process.
     *
     * @param  object  The mimePart to add the image to
     * @param  array   The attachment information
     * @return object  The image mimePart object
     * @access private
     */
    function &_addAttachmentPart(&$obj, $value)
    {
        $params['content_type'] = $value['c_type'];
        $params['encoding']     = $value['encoding'];
        $params['disposition']  = 'attachment';
        $params['dfilename']    = $value['name'];
        $obj->addSubpart($value['body'], $params);
    }

    /**
     * Builds the multipart message from the list ($this->_parts) and
     * returns the mime content.
     *
     * @param  array  Build parameters that change the way the email
     *                is built. Should be associative. Can contain:
     *                text_encoding  -  What encoding to use for plain text
     *                                  Default is 7bit
     *                html_encoding  -  What encoding to use for html
     *                                  Default is quoted-printable
     *                7bit_wrap      -  Number of characters before text is
     *                                  wrapped in 7bit encoding
     *                                  Default is 998
     *                html_charset   -  The character set to use for html.
     *                                  Default is iso-8859-1
     *                text_charset   -  The character set to use for text.
     *                                  Default is iso-8859-1
     *                head_charset   -  The character set to use for headers.
     *                                  Default is iso-8859-1
     * @return string The mime content
     * @access public
     */
    function &get($build_params = null)
    {
        if (isset($build_params)) {
            while (list($key, $value) = each($build_params)) {
                $this->_build_params[$key] = $value;
            }
        }

        if (!empty($this->_html_images) AND isset($this->_htmlbody)) {
            foreach ($this->_html_images as $value) {
                $regex = '#(\s)((?i)src|background|href(?-i))\s*=\s*(["\']?)' . preg_quote($value['name'], '#') .
                         '\3#';
                $rep = '\1\2=\3cid:' . $value['cid'] .'\3';
                $this->_htmlbody = preg_replace($regex, $rep,
                                       $this->_htmlbody
                                   );
            }
        }

        $null        = null;
        $attachments = !empty($this->_parts)                ? true : false;
        $html_images = !empty($this->_html_images)          ? true : false;
        $html        = !empty($this->_htmlbody)             ? true : false;
        $text        = (!$html AND !empty($this->_txtbody)) ? true : false;

        switch (true) {
        case $text AND !$attachments:
            $message =& $this->_addTextPart($null, $this->_txtbody);
            break;

        case !$text AND !$html AND $attachments:
            $message =& $this->_addMixedPart();
            for ($i = 0; $i < count($this->_parts); $i++) {
                $this->_addAttachmentPart($message, $this->_parts[$i]);
            }
            break;

        case $text AND $attachments:
            $message =& $this->_addMixedPart();
            $this->_addTextPart($message, $this->_txtbody);
            for ($i = 0; $i < count($this->_parts); $i++) {
                $this->_addAttachmentPart($message, $this->_parts[$i]);
            }
            break;

        case $html AND !$attachments AND !$html_images:
            if (isset($this->_txtbody)) {
                $message =& $this->_addAlternativePart($null);
                $this->_addTextPart($message, $this->_txtbody);
                $this->_addHtmlPart($message);
            } else {
                $message =& $this->_addHtmlPart($null);
            }
            break;

        case $html AND !$attachments AND $html_images:
            if (isset($this->_txtbody)) {
                $message =& $this->_addAlternativePart($null);
                $this->_addTextPart($message, $this->_txtbody);
                $related =& $this->_addRelatedPart($message);
            } else {
                $message =& $this->_addRelatedPart($null);
                $related =& $message;
            }
            $this->_addHtmlPart($related);
            for ($i = 0; $i < count($this->_html_images); $i++) {
                $this->_addHtmlImagePart($related, $this->_html_images[$i]);
            }
            break;

        case $html AND $attachments AND !$html_images:
            $message =& $this->_addMixedPart();
            if (isset($this->_txtbody)) {
                $alt =& $this->_addAlternativePart($message);
                $this->_addTextPart($alt, $this->_txtbody);
                $this->_addHtmlPart($alt);
            } else {
                $this->_addHtmlPart($message);
            }
            for ($i = 0; $i < count($this->_parts); $i++) {
                $this->_addAttachmentPart($message, $this->_parts[$i]);
            }
            break;

        case $html AND $attachments AND $html_images:
            $message =& $this->_addMixedPart();
            if (isset($this->_txtbody)) {
                $alt =& $this->_addAlternativePart($message);
                $this->_addTextPart($alt, $this->_txtbody);
                $rel =& $this->_addRelatedPart($alt);
            } else {
                $rel =& $this->_addRelatedPart($message);
            }
            $this->_addHtmlPart($rel);
            for ($i = 0; $i < count($this->_html_images); $i++) {
                $this->_addHtmlImagePart($rel, $this->_html_images[$i]);
            }
            for ($i = 0; $i < count($this->_parts); $i++) {
                $this->_addAttachmentPart($message, $this->_parts[$i]);
            }
            break;

        }

        if (isset($message)) {
            $output = $message->encode();
            $output['headers'][] = 'Mime-Version: 1.0';
            $this->_headers = array_merge($this->_headers,
                                          $output['headers']);
            return $output['body'];

        } else {
            return false;
        }
    }

    /**
     * Returns an array with the headers needed to prepend to the email
     * (MIME-Version and Content-Type). Format of argument is:
     * $array['header-name'] = 'header-value';
     *
     * @param  array $xtra_headers Assoc array with any extra headers.
     *                             Optional.
     * @return array Assoc array with the mime headers
     * @access public
     */
    function &headers($xtra_headers = null)
    {
        // Content-Type header should already be present,
        // So just add mime version header
        $headers['MIME-Version'] = '1.0';
        if (isset($xtra_headers)) {
            $headers = array_merge($headers, $xtra_headers);
        }
        $this->_headers = array_merge($headers, $this->_headers);

        return $this->_encodeHeaders($this->_headers);
    }

    /**
     * Get the text version of the headers
     * (usefull if you want to use the PHP mail() function)
     *
     * @param  array   $xtra_headers Assoc array with any extra headers.
     *                               Optional.
     * @return string  Plain text headers
     * @access public
     */
    function txtHeaders($xtra_headers = null)
    {
        $headers = $this->headers($xtra_headers);
        $ret = '';
        foreach ($headers as $key => $val) {
            $ret .= "$key: $val" . MAIL_MIME_CRLF;
        }
        return $ret;
    }

    /**
     * Sets the Subject header
     *
     * @param  string $subject String to set the subject to
     * access  public
     */
    function setSubject($subject)
    {
        $this->_headers['Subject'] = $subject;
    }

    /**
     * Set an email to the From (the sender) header
     *
     * @param  string $email The email direction to add
     * @access public
     */
    function setFrom($email)
    {
        $this->_headers['From'] = $email;
    }

    /**
     * Add an email to the Cc (carbon copy) header
     * (multiple calls to this method are allowed)
     *
     * @param  string $email The email direction to add
     * @access public
     */
    function addCc($email)
    {
        if (isset($this->_headers['Cc'])) {
            $this->_headers['Cc'] .= ", $email";
        } else {
            $this->_headers['Cc'] = $email;
        }
    }

    /**
     * Add an email to the Bcc (blank carbon copy) header
     * (multiple calls to this method are allowed)
     *
     * @param  string $email The email direction to add
     * @access public
     */
    function addBcc($email)
    {
        if (isset($this->_headers['Bcc'])) {
            $this->_headers['Bcc'] .= ", $email";
        } else {
            $this->_headers['Bcc'] = $email;
        }
    }

    /**
     * Encodes a header as per RFC2047
     *
     * @param  string  $input The header data to encode
     * @return string  Encoded data
     * @access private
     */
    function _encodeHeaders($input)
    {
        foreach ($input as $hdr_name => $hdr_value) {
            preg_match_all('/(\w*[\x80-\xFF]+\w*)/', $hdr_value, $matches);
            foreach ($matches[1] as $value) {
                $replacement = preg_replace('/([\x80-\xFF])/e',
                                            '"=" .
                                            strtoupper(dechex(ord("\1")))',
                                            $value);
                $hdr_value = str_replace($value, '=?' .
                                         $this->_build_params['head_charset'] .
                                         '?Q?' . $replacement . '?=',
                                         $hdr_value);
            }
            $input[$hdr_name] = $hdr_value;
        }

        return $input;
    }

    /**
     * Set the object's end-of-line and define the constant if applicable
     *
     * @param string $eol End Of Line sequence
     * @access private
     */
    function _setEOL($eol)
    {
        $this->_eol = $eol;
        if (!defined('MAIL_MIME_CRLF')) {
            define('MAIL_MIME_CRLF', $this->_eol, true);
        }
    }



} // End of class
?>