AS3CF_Filter::get_urls_from_content PHP Метод

    protected function get_urls_from_content($content, $cache, &$to_cache)
    {
        $url_pairs = array();
        if (!preg_match_all('/(http|https)?:?\\/\\/[^"\'\\s<>\\\\]*/', $content, $matches) || !isset($matches[0])) {
            // No URLs found, return
            return $url_pairs;
        }
        $matches = array_unique($matches[0]);
        $urls = array();
        foreach ($matches as $url) {
            if (!$this->url_needs_replacing($url)) {
                // URL already correct, skip
                continue;
            }
            $parts = parse_url($url);
            if (!isset($parts['path'])) {
                // URL doesn't have a path, continue
                continue;
            }
            $info = pathinfo($parts['path']);
            if (!isset($info['extension'])) {
                // URL doesn't have a file extension, continue
                continue;
            }
            $attachment_id = null;
            $bare_url = $this->as3cf->maybe_remove_query_string($url);
            if (isset($cache[$bare_url])) {
                $attachment_id = $cache[$bare_url];
                if ($this->is_failure($attachment_id)) {
                    // Attachment ID failure, continue
                    continue;
                }
            }
            if (is_null($attachment_id) || is_array($attachment_id)) {
                // Attachment ID not cached, need to search by URL.
                $urls[] = $url;
            } else {
                $this->push_to_url_pairs($url_pairs, $attachment_id, $url, $to_cache);
            }
        }
        if (!empty($urls)) {
            $attachments = $this->get_attachment_ids_from_urls($urls);
            foreach ($attachments as $url => $attachment_id) {
                if (!$attachment_id) {
                    // Can't determine attachment ID, continue
                    $this->url_cache_failure($url, $to_cache);
                    continue;
                }
                $this->push_to_url_pairs($url_pairs, $attachment_id, $url, $to_cache);
            }
        }
        return $url_pairs;
    }