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

Export data to CSV file in C#, VB.NET, Java, PHP, ASP classic, C++, C++.NET, VB6 and more, ASP.NET, MVC, from datatable or from list!
http://www.easyxls.com/manual/basics/export-to-csv-file-format.html

Export data to HTML file in C#, VB.NET, Java, PHP, ASP classic, C++, C++.NET, VB6 and more, ASP.NET, MVC, from datatable or from list!
http://www.easyxls.com/manual/basics/export-to-html-file-format.html

Export data to text file in C#, VB.NET, Java, PHP, ASP classic, C++, C++.NET, VB6 and more, ASP.NET, MVC, from datatable or from list!
http://www.easyxls.com/manual/basics/export-to-txt-file-format.html

Read data from XLSB Excel file in PHP!
http://www.easyxls.com/manual/tutorials/php/read-xlsb-file.html

Read data from XLSX Excel file in PHP!
http://www.easyxls.com/manual/tutorials/php/read-xlsx-file.html

Read data from XLS Excel file in PHP!
http://www.easyxls.com/manual/tutorials/php/read-xls-file.html

Import Excel sheet to List in PHP!
http://www.easyxls.com/manual/tutorials/php/import-excel-sheet-to-list.html