$document = new \PhpOffice\PhpWord\PhpWord();
$final_document = \PhpOffice\PhpWord\IOFactory::createWriter($document, 'Word2007');
$section = $document->createSection(($i=0));
foreach($files as $file)
{
 $_document = $document->loadTemplate($file);
 $section->addPageBreak();
}
$final_document->save($filename);