WPSEO_Sitemap_Image_Parser::parse_html_images PHP Method

    private function parse_html_images($content)
    {
        $images = array();
        if (!class_exists('DOMDocument')) {
            return $images;
        }
        if (empty($content)) {
            return $images;
        }
        // Prevent DOMDocument from bubbling warnings about invalid HTML.
        libxml_use_internal_errors(true);
        $post_dom = new DOMDocument();
        $post_dom->loadHTML('<?xml encoding="' . $this->charset . '">' . $content);
        // Clear the errors, so they don't get kept in memory.
        libxml_clear_errors();
        /** @var DOMElement $img */
        foreach ($post_dom->getElementsByTagName('img') as $img) {
            $src = $img->getAttribute('src');
            if (empty($src)) {
                continue;
            }
            $class = $img->getAttribute('class');
            if (!empty($class) && false === strpos($class, 'size-full') && preg_match('|wp-image-(?P<id>\\d+)|', $class, $matches) && get_post_status($matches['id'])) {
                $src = $this->image_url($matches['id']);
            }
            $src = $this->get_absolute_url($src);
            if (strpos($src, $this->host) === false) {
                continue;
            }
            if ($src !== esc_url($src)) {
                continue;
            }
            $images[] = array('src' => $src, 'title' => $img->getAttribute('title'), 'alt' => $img->getAttribute('alt'));
        }
        return $images;
    }