Change background color of some rows

Change background color in MATE

        $this->Editor->setConfig('modifyRowSets',array(&$this,'changeBgColor')); and

    function changeBgColor($rowSets,$rowInfo,$rowNum)
    {
        $day_diff = strtotime($rowInfo['expiry']) - strtotime(date('Y-m-d'));
        $day_diff = $day_diff / (24*60*60); // difference in days.

        if( $day_diff < 90 )
        {
         // $rowSets['bgcolor'] = '#ffffff';
            $rowSets['bgcolor'] = 'pink';
            $rowSets['class'] = 'clickable';
        }
        return $rowSets;
    }