merge rev 2771,2772 from branch 2.0

- 2771 event tracer improvement: option to show all registered event handlers for every page
- 2772 php optims (small): remove/replace preg_xxx with faster simple string functions

git-svn-id: http://piwigo.org/svn/trunk@2773 68402e56-0260-453c-a942-63ccdbb3a9ee

include/functions_html.inc.php

@@ -81,7 +81,7 @@ function create_navigation_bar(
 
   $pages_around = $conf['paginate_pages_around'];
   $start_str = $clean_url ? '/start-' :
-    ( ( strstr($url, '?')===false ? '?':'&') . 'start=' );
+    ( ( strpos($url, '?')===false ? '?':'&') . 'start=' );
 
   $navbar = '';
 
@@ -781,8 +781,7 @@ function set_status_header($code, $text='')
 function render_category_description($desc)
 {
   global $conf;
-  if ( !( $conf['allow_html_descriptions'] and
-          preg_match('/<(div|br|img|script).*>/i', $desc) ) )
+  if ( !$conf['allow_html_descriptions'] )
   {
     $desc = nl2br($desc);
   }
@@ -827,4 +826,4 @@ function register_default_menubar_blocks( $menu_ref_arr )
   $menu->register_block( new RegisteredBlock( 'mbIdentification', 'identification', 'piwigo') );
 }
 
-?>
+?>