# 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:

```sh
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.