Question

I have got a problem with PHPExcel as below function

function Test($a, $b) {

    //  Create a new PHPExcel object with a single sheet
    $objPHPExcel = new PHPExcel();
    $activeSheet = $objPHPExcel->getActiveSheet();

    $activeSheet->SetCellValue('B2',$a);
    $activeSheet->SetCellValue('B3',$b);
    $activeSheet->SetCellValue('C4',"=B2+B3");
    $C4 = $activeSheet ->getCell('C4')->getCalculatedValue();

    echo "C4:$C4<br/>";
}

Finally, I call this function

Test(10, 20);
Test(40, 70);
Test(30, 80);

but, result is

C4:30
C4:30
C4:30 

Why getCalculatedValue() DOESN’T change result? It seems like this function only gets the first value.

Answer 1

You can change the result, but for performance reasons the calculation engine caches the result of a formula calculation once it’s been calculated. If you want to change the underlying data, you have to flush that cache before requesting the calculated value again:

PHPExcel_Calculation::getInstance()->clearCalculationCache();

or

PHPExcel_Calculation::flushInstance();

You can also change this default behaviour – so that results are not cached at all – before issuing any other requests to the calculation engine:

PHPExcel_Calculation::getInstance()->setCalculationCacheEnabled(FALSE);