Create Excel file with formula in sheet cells using EasyXLS library! XLS, XLSX, XLSM, XLSB files in PHP.
https://www.easyxls.com/manual/tutorials/php/add-excel-formula.html

Merge cells for Excel file using EasyXLS library! XLS, XLSX, XLSM, XLSB files in PHP.
https://www.easyxls.com/manual/tutorials/php/excel-merge-cells.html

How to set print area, page orientation, paper size or page breaks for Excel file in PHP using EasyXLS Excel library
https://www.easyxls.com/manual/tutorials/php/excel-print-area-page-orientation.html

Create Excel with header & footer in PHP by EasyXLS library! XLS, XLSX, XLSM, XLSB files in PHP.
https://www.easyxls.com/manual/tutorials/php/excel-footer-header.html

Excel cell comment in PHP by EasyXLS library! XLS, XLSX, XLSM, XLSB files in PHP.
https://www.easyxls.com/manual/tutorials/php/excel-cell-comment.html

How to export and protect Excel sheet, data in cells, objects in sheets from PHP using EasyXLS Excel library.

https://www.easyxls.com/manual/tutorials/php/protect-excel-sheet-cells.html

How to set various document properties for Excel file like Title property, Subject property, Comments, Authors property, Company property or any custom property and export Excel file in C#.NET.

https://www.easyxls.com/manual/tutorials/csharp/document-summary-information.html

Export data to XML Spreadsheet file in C#.NET from ASP.NET web pages, windows applications, winforms, console applications! Spreadsheets in .NET.
https://www.easyxls.com/manual/tutorials/csharp/export-data-to-xml-file.html