Combine two or more xls files as worksheets PHPExcel

Question

I've been looking everywhere on how to do this with two existing files, looks like all documentation is on creating new files. I'd like to take one of the files and add the second file to it as a new worksheet then save it to the server. I've been trying with no avail like this:

$file="test.xls";
$file2="test2.xls";
$outputFile = "final.xls";
$phpExcel = new PHPExcel($file);
$phpExcel->getActiveSheet();
$phpExcel->setActiveSheetIndex(0);
$phpExcel->addSheet($file2);
header("Content-Type: application/vnd.ms-excel");
header("Content-Disposition: attachment; filename=$outputFile");
header("Cache-Control: max-age=0");
$objWriter = PHPExcel_IOFactory::createWriter($phpExcel, "Excel5");
file_put_contents($outputFile, $objWriter);

Any help would be greatly appreciated. Very new to PHP.

Answer 1

Doesn't anybody ever read documentation these days? There's a whole document in the folder called /Documentation about reading files to PHPExcel objects (it's called PHPExcel User Documentation - Reading Spreadsheet Files), together with dozens of examples (the /Documentation/Examples/Reader folder is a good place to look), and none of them use new PHPExcel($file). Nor do any of the examples or any of the documents say to use file_put_contents() when saving.

$file1="test.xls";
$file2="test2.xls";
$outputFile = "final.xls";

// Files are loaded to PHPExcel using the IOFactory load() method
$objPHPExcel1 = PHPExcel_IOFactory::load($file1);
$objPHPExcel2 = PHPExcel_IOFactory::load($file2);

// Copy worksheets from $objPHPExcel2 to $objPHPExcel1
foreach($objPHPExcel2->getAllSheets() as $sheet) {
    $objPHPExcel1->addExternalSheet($sheet)
}

// Save $objPHPExcel1 to browser as an .xls file
$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel1, "Excel5");
header("Content-Type: application/vnd.ms-excel");
header("Content-Disposition: attachment; filename=$outputFile");
header("Cache-Control: max-age=0");
$objWriter->save('php://output');