Zend_Mail inline images in e-mail: CID attachment (tested in Gmail, Outlook.com, Outlook 2010)

Zend_Mail_InlineImages.php

<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to [email protected] so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Mail
 * @copyright  Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */


/**
 * @see Zend_Mail
 */
require_once 'Zend/Mail.php';

/**
 * Class for sending an email.
 *
 * @category   Zend
 * @package    Zend_Mail
 * @copyright  Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Mail_InlineImages extends Zend_Mail
{

	/**
     * Sets the HTML body for the message
     *
     * @param  string    $html
     * @param  string    $charset
     * @param  string    $encoding
     * @return Zend_Mail Provides fluent interface
     */
	public function setBodyHtml($html, $charset = null, $encoding = Zend_Mime::ENCODING_QUOTEDPRINTABLE, $preload_images = true)
	{
		if ($preload_images)
		{
			$this->setType(Zend_Mime::MULTIPART_RELATED);

			$dom = new DOMDocument(null, $this->getCharset());
			@$dom->loadHTML($html);

			$images = $dom->getElementsByTagName('img');

			for ($i = 0; $i < $images->length; $i++)
			{
				$img = $images->item($i);
				$url = $img->getAttribute('src');

				$image_http = new Zend_Http_Client($url);
				$response = $image_http->request();

				if ($response->getStatus() == 200)
				{
					$image_content = $response->getBody();

					$pathinfo = pathinfo($url);
					$mime_type = $response->getHeader('Content-Type');

					$mime = new Zend_Mime_Part($image_content);
					
					$mime->id          = md5($url);
					$mime->location    = $url;
					$mime->type        = $mime_type;
					$mime->disposition = Zend_Mime::DISPOSITION_INLINE;
					$mime->encoding    = Zend_Mime::ENCODING_BASE64;
					$mime->filename    = $pathinfo['basename'];
					
					$html = str_replace($url, 'cid:'.md5($url) ,$html);
					
					$this->addAttachment($mime);
				}
			}
		}
	
		return parent::setBodyHtml($html, $charset, $encoding);
	}
}