One closest solution I can give you is setting background color for the utilized range of the sheet (if you're data is within the vicinity of the sheet, increase the range to something like 'A1:Z100', but beware it's memory intense act)
$usedRange = $objPHPExcel->getActiveSheet(0)->calculateWorksheetDimension();
//For used data range
//$usedRange = $objPHPExcel->getActiveSheet(0)->calculateWorksheetDataDimension();
$objPHPExcel->getActiveSheet(0)->getStyle($usedRange)->applyFromArray(
array('fill' => array(
'type' => PHPExcel_Style_Fill::FILL_SOLID,
'color' => array('argb' => 'FFFFFFFF')
),
)
);
I believe there are certain limitations when it comes to accessing entire sheet. Unlike in Excel VBA following statement may not even execute since it's swallow all your server memory which hardly takes microseconds in excel macro.
ActiveSheet.Range("A1:IV65536").Interior.ColorIndex = 13