Sunray Modifications

1. Adding setLabelSkipInterval() to the PHPExcel_Chart_Axis class which allows for setting interval spacing on an axis.
2. Adding setTickSkipInterval() to the PHPExcel_Chart_Axis class which allows for setting interval spacing for tick marks.

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PHPExcel - DEPRECATED

PHPExcel last version, 1.8.1, was released in 2015. The project is no longer maintained and should not be used anymore.

All users should migrate to its direct successor PhpSpreadsheet, or another alternative.

In a few months, the GitHub project will be marked as archived, so everything will be read-only.

License

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