Class Libraries & REST APIs for the developers to manipulate & process Files from Word, Excel, PowerPoint, Visio, PDF, CAD & several other categories in Web, Desktop or Mobile apps. Develop & deploy on Windows, Linux, MacOS & Android platforms....$dataDir = '' ; $workbook1 = new Workbook ( $dataDir . "Book1.xls" );..."Book2.xls" ); // Creating an Workbook object with the stream object...