PhpSpreadsheet/docs/topics/migration-from-PHPExcel.md

Migration from PHPExcel

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 classes to their new names.

The tool is included in PhpSpreadsheet. It scans recursively all files and directories, starting from the current directory. Assuming it was installed with composer, it can be run like so:

cd /project/to/migrate/src
/project/to/migrate/vendor/phpoffice/phpspreadsheet/bin/migrate-from-phpexcel

Important The tool will irreversibly modify your sources, be sure to backup everything, and double check the result before committing.