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....new SaveFormat (); $workbook = new Workbook ( $dataDir . "Book1...the document in PDF format $workbook -> save ( $dataDir . "OutBook1...