K2: Use of undefined constant g - assumed 'g' in ... eval()'d code on line 1 - K2

Notice
Use of undefined constant g - assumed 'g' in /ПУТЬ_К_ХОСТИНГУ/public_html/templates/МОЙ_ШАБЛОН/html/com_k2/templates/moy-k2/category.php(62) : eval()'d code on line 1

if($note = JFactory::getApplication()->getMenu()->getActive()->note){
$params = explode('=', substr($note, 1));
eval('$'.substr($note, 1).';'); // здесь ошибка
JRequest::setVar( 'f', $f );
$skryt = false;
$document = JFactory::getDocument();
$renderer = $document->loadRenderer('module');
$params = array('style'=>'xhtml');
$dbo = JFactory::getDBO();
$dbo->setQuery("SELECT * FROM #__modules WHERE id=$module_id ");
$module = $dbo->loadObject();
$module->user = '';
$modulFiltrZamena = $renderer->render($module, $params);
JRequest::setVar( 'f', '' );

&f['g'][22][0]=1

&f[$g][22][0]=1

eval('$'.substr($note, 1).';');

eval('$f["g"][22][0]=1;');

eval('$'.substr($note, 1).';');

$strReplaceSubstrNote = str_replace('[g]', '["g"]', substr($note, 1));
eval('$'.$strReplaceSubstrNote.';');