public function render(Varien_Object $row) { $groups = $this->_getNewsletterGroupOptions(); $groupStr = $row->getNewsletterGroupId(); $groupArr = explode(',', $groupStr); $str = ''; $count = count($groupArr); for ($i = 0; $i < $count; $i++) { if ($i == $count - 1) { $str .= $groups[$groupArr[$i]]; } else { $str .= $groups[$groupArr[$i]] . ', '; } } return $str; }