fixed xhtml problem in repeared header elements which had [] in id.

diff --git a/lib/formslib.php b/lib/formslib.php
index 4237a1db43e7743f262a2105e4be6bd278487cfb..88112f7f5f7b48acc4791e2a0765a141dc292e51 100644 (file)
--- a/lib/formslib.php
+++ b/lib/formslib.php
@@ -1416,6 +1416,7 @@ class MoodleQuickForm_Renderer extends HTML_QuickForm_Renderer_Tableless{
         $name = $header->getName();
 
         $id = empty($name) ? '' : ' id="' . $name . '"';
+        $id = preg_replace(array('/\]/', '/\[/'), array('', '_'), $id);
         if (is_null($header->_text)) {
             $header_html = '';
         } elseif (!empty($name) && isset($this->_templates[$name])) {