PHPでphpexcelの背景色を設定する方法

function cellColor($cells,$color){
    global $objPHPExcel;

    $objPHPExcel->getActiveSheet()->getStyle($cells)->getFill()->applyFromArray(array(
        'type' => PHPExcel_Style_Fill::FILL_SOLID,
        'startcolor' => array(
             'rgb' => $color        
             )
    ));
    }
    cellColor('B5', 'F28A8C');
    cellColor('G5', 'F28A8C');
    cellColor('A7:I7', 'F28A8C');
    cellColor('A17:I17', 'F28A8C');
    cellColor('A30:Z30', 'F28A8C');