_MarkdownExtra_TmpImpl::_doAnchors_reference_callback PHP Method

    protected function _doAnchors_reference_callback($matches)
    {
        $whole_match = $matches[1];
        $link_text = $matches[2];
        $link_id =& $matches[3];
        if ($link_id == "") {
            # for shortcut links like [this][] or [this].
            $link_id = $link_text;
        }
        # lower-case and turn embedded newlines into spaces
        $link_id = strtolower($link_id);
        $link_id = preg_replace('{[ ]?\\n}', ' ', $link_id);
        if (isset($this->urls[$link_id])) {
            $url = $this->urls[$link_id];
            $url = $this->encodeURLAttribute($url);
            $result = "<a href=\"{$url}\"";
            if (isset($this->titles[$link_id])) {
                $title = $this->titles[$link_id];
                $title = $this->encodeAttribute($title);
                $result .= " title=\"{$title}\"";
            }
            if (isset($this->ref_attr[$link_id])) {
                $result .= $this->ref_attr[$link_id];
            }
            $link_text = $this->runSpanGamut($link_text);
            $result .= ">{$link_text}</a>";
            $result = $this->hashPart($result);
        } else {
            $result = $whole_match;
        }
        return $result;
    }