Mandrill PHP API filter embedded images array with embedded images used in e-mail HTML content

mandrill-api-filter-embedded-images-list.php

    /**
     * Insert list of embedded images (Mandrill API format) & HTML content
     * Finds cid elements in HTML and filters $images list with it
     * Unused images are shown as attachment in Outlook eg
     *
     * Format of $images:
     *
     * $images = array(
     *      array(
     *          'type' => 'image/png',
     *           'name' => 'name',
     *          'content' => base64_encode(file_get_contents('/path/to/file'))
     *      ),
     *      ..
     * );
     *
     * @param array $images
     * @param $html
     * @return array
     */
    static public function stripImagesMandrillAPI(array $images, $html)
    {
        if(!preg_match_all('/src="cid:(.*)"/Uims', $html, $matches)) {
            return $images;
        }

        return array_filter($images, function($image) use ($matches) {
            return in_array($image['name'], $matches[1]);
        });
    }