Многостраничный документ

$delimiter   = isset($delimiter)? $delimiter : "<!--[page]-->";
$tplNext     = isset($tplNext)  ? $tplNext   : '»';
$tplPrev     = isset($tplPrev)  ? $tplPrev   : '«';


$e = &$modx->Event;

switch($e->name) {
	case 'OnLoadWebDocument':
		$content     = $modx->documentObject['content'];
		$pagecontent = explode($delimiter, $content);
		$countpages  = count($pagecontent);
		if ($countpages>1) {
			$currentpage = isset($_GET['page']) ? $_GET['page'] : 1;
			if (($currentpage>$countpages) || ($currentpage<1)) $currentpage = 1;
			
			$currentpageid = $modx->documentObject['id'];
			$url = $modx->makeUrl($currentpageid);
			$char = ((strpos($url,"?")===false) ? "?":"&");
			
			$char = ($modx->config['friendly_urls'] == 0) ? "&" : "?";
			$url = $modx->makeurl($modx->documentObject['id'], '', $char.'page=');
			
			$prevpage = $currentpage-1;
			$nextpage = $currentpage+1;
			
			$linkprev = ($prevpage>0) ? ("<a href=\"[~$currentpageid~]" . $char . "page=$prevpage\">" . $tplPrev . "</a>") : '';
			$linknext = ($nextpage<=$countpages) ? ("<a href=\"[~$currentpageid~]" . $char . "page=$nextpage\">" . $tplNext . "</a>") : '';
			
			for ($display=1; $display<=$countpages; $display++) {
				if ($display != $currentpage) {
					$pages[] = "<a class=\"pip_page\" href='[~$currentpageid~]" . $char . "page=$display'>$display</a>";
				} else {
					$pages[] = "<span class=\"pip_currentpage\">[$display]</span>";
				}
			}
			$pages = implode(' - ', $pages);
			
			$content = $pagecontent[$currentpage-1];
			$modx->setPlaceholder('countpages',  $countpages);
			$modx->setPlaceholder('currentpage', $currentpage);
			$modx->setPlaceholder('previouspage',    $prevpage);
			$modx->setPlaceholder('nextpage',    $nextpage);
			$modx->setPlaceholder('previous',    $linkprev);
			$modx->setPlaceholder('next',    $linknext);
			$modx->setPlaceholder('pages',       $pages);
			
		}
		$modx->documentObject['content'] = $content;
		break;
	case "OnDocFormSave":
		$pagecontent = explode($delimiter, $_POST['ta']);
		if (count($pagecontent)>1) {
   			$fields = array('cacheable' => 0);
    		$table = $modx->getFullTableName('site_content');
  			// Update the database
			$rows_affected = $modx->db->update(
				$fields, 
				$table,
				"id = {$e->params['id']}"
			);
		}
		break;
	default:
		return;
		break;
}