_MarkdownExtra_TmpImpl::_appendFootnotes_callback PHP Method

    protected function _appendFootnotes_callback($matches)
    {
        $node_id = $this->fn_id_prefix . $matches[1];
        # Create footnote marker only if it has a corresponding footnote *and*
        # the footnote hasn't been used by another marker.
        if (isset($this->footnotes[$node_id])) {
            $num =& $this->footnotes_numbers[$node_id];
            if (!isset($num)) {
                # Transfer footnote content to the ordered list and give it its
                # number
                $this->footnotes_ordered[$node_id] = $this->footnotes[$node_id];
                $this->footnotes_ref_count[$node_id] = 1;
                $num = $this->footnote_counter++;
                $ref_count_mark = '';
            } else {
                $ref_count_mark = $this->footnotes_ref_count[$node_id] += 1;
            }
            $attr = "";
            if ($this->fn_link_class != "") {
                $class = $this->fn_link_class;
                $class = $this->encodeAttribute($class);
                $attr .= " class=\"{$class}\"";
            }
            if ($this->fn_link_title != "") {
                $title = $this->fn_link_title;
                $title = $this->encodeAttribute($title);
                $attr .= " title=\"{$title}\"";
            }
            $attr = str_replace("%%", $num, $attr);
            $node_id = $this->encodeAttribute($node_id);
            return "<sup id=\"fnref{$ref_count_mark}:{$node_id}\">" . "<a href=\"#fn:{$node_id}\"{$attr}>{$num}</a>" . "</sup>";
        }
        return "[^" . $matches[1] . "]";
    }