GridView show sum of columns in footer `PHP use yii\grid\DataColumn;

/**

• Sum of all the values in the column

• @author shiv / class TSumColumn extends DataColumn { public function getDataCellValue($model, $key, $index) {

   $value = parent::getDataCellValue($model, $key, $index);
   if ( is_numeric($value))
   {
       $this->footer += $value;
   }
      
   return $value;
  

  } } `

Now you have to enable footer in GridView

echo GridView::widget([
        'dataProvider' => $dataProvider,
        'filterModel' => $searchModel,
        'showFooter' => true,

Also change the coulmn class

            [
                'class' => TSumColumn::class,
                'attribute' => 'amount'
            ],

You would see the total in footer of the grid. you can apply this to multiple columns if need