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function createCatalog($obj) {
    $obj = preg_replace_callback('/<h([1-6])(.*?)>(.*?)<\/h\1>/i', function ($obj) {
        global $catalog;
        global $catalog_count;
        $catalog_count++;
        $catalog[] = array('text' => trim(strip_tags($obj[3])), 'depth' => $obj[1], 'count' => $catalog_count);
        return '<h'.$obj[1].$obj[2].'>'.$obj[3].'</h'.$obj[1].'>';
    }, $obj);
    return $obj;
}

function getCatalog() {
    global $catalog;
    $index = '';
    if ($catalog) {
        $index = '<ul>' . "\n";
        $prev_depth = '';
        $to_depth = 0;
        foreach ($catalog as $catalog_item) {
            $catalog_depth = $catalog_item['depth'];
            if ($prev_depth) {
                if ($catalog_depth == $prev_depth) {
                    $index .= '</li>' . "\n";
                } elseif ($catalog_depth > $prev_depth) {
                    $to_depth++;
                    $index .= '<ul>' . "\n";
                } else {
                    $to_depth2 = ($to_depth > ($prev_depth - $catalog_depth)) ? ($prev_depth - $catalog_depth) : $to_depth;
                    if ($to_depth2) {
                        for ($i = 0; $i < $to_depth2; $i++) {
                            $index .= '</li>' . "\n" . '</ul>' . "\n";
                            $to_depth--;
                        }
                    }
                    $index .= '</li>';
                }
            }
            $index .= '<li><a href="#'. $catalog_item['text'] .'">' . $catalog_item['text'] . '</a>';
            $prev_depth = $catalog_item['depth'];
        }
        for ($i = 0; $i <= $to_depth; $i++) {
            $index .= '</li>' . "\n" . '</ul>' . "\n";
        }
       
            
    }
    echo $index;
}

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<?php
$content = preg_replace('#<h(.*?)>(.*?)</h(.*?)>#','<h$1 id="$2">$2</h$3>',$this->content);
echo $content;
?>