PhpSpreadsheet introduced many breaking changes by introducing namespaces and renaming some classes. To help you migrate existing project, a tool was written to replace all references to PHPExcel ...

PHPExcel implements an autoloader or "lazy loader" ", which means that it is not necessary to include every file within PHPExcel. It is only necessary to include the initial PHPExcel class file, then ...

Lets cut the chase and see how can we do it : First of all extract the .zip folder of the library file which we have just downloaded and put it in the setup folder where we need to include. Now, ...