Local clone of [PhpSpreadsheet](https://github.com/PHPOffice/PhpSpreadsheet/)
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Matt Allan f28289f92a
Use a generator for Cells::getAllCacheKeys
Using a generator reduces memory usage and improves performance
when loading large spreadsheets.

Closes #822
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README.md

PhpSpreadsheet

Master: Build Status Code Quality Code Coverage Total Downloads Latest Stable Version License Join the chat at https://gitter.im/PHPOffice/PhpSpreadsheet

Develop: Build Status Code Quality Code Coverage

PhpSpreadsheet is a library written in pure PHP and providing a set of classes that allow you to read from and to write to different spreadsheet file formats, like Excel and LibreOffice Calc.

Documentation

Read more about it, including install instructions, in the official documentation. Or check out the API documentation.

Please ask your support questions on StackOverflow, or have a quick chat on Gitter.

PHPExcel vs PhpSpreadsheet ?

PhpSpreadsheet is the next version of PHPExcel. It breaks compatibility to dramatically improve the code base quality (namespaces, PSR compliance, use of latest PHP language features, etc.).

Because all efforts have shifted to PhpSpreadsheet, PHPExcel will no longer be maintained. All contributions for PHPExcel, patches and new features, should target PhpSpreadsheet develop branch.

License

PhpSpreadsheet is licensed under LGPL (GNU LESSER GENERAL PUBLIC LICENSE)