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....//Adding a new worksheet to the Workbook object $worksheets = $workbook...getWorksheets (); $worksheet = $worksheets -> get ( 0 ); //Displaying...