TbTotalSumColumn.php

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<?php
Yii::import('booster.widgets.TbDataColumn');

class TbTotalSumColumn extends TbDataColumn
{
        public $totalExpression;

        public $totalValue;

        protected $total = 0;

        public function init()
        {
                parent::init();

                if (!is_null($this->totalExpression)) {
                        $this->total = is_numeric($this->totalExpression)
                                ? $this->totalExpression
                                : $this->evaluateExpression(
                                        $this->totalExpression
                                );
                }
                $this->footer = true;
        }

        protected function renderDataCellContent($row, $data)
        {
                ob_start();
                parent::renderDataCellContent($row, $data);
                $value = ob_get_clean();

                if (is_numeric($value)) {
                        $this->total += $value;
                }
                echo $value;
        }

        protected function renderFooterCellContent()
        {
                if (is_null($this->total)) {
                        parent::renderFooterCellContent();
                }

                echo $this->totalValue ? $this->evaluateExpression($this->totalValue, array('total' => $this->total))
                        : $this->grid->getFormatter()->format($this->total, $this->type);
        }
}