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The docs directory on their github repository contains a lot of examples on how to read, modify and save spreadsheet files. They also have some documentation on their website.
If you don't have a lot of formatting requirements beyond just the placement of the data in the correct fields, I really enjoy Box/Spout (https://opensource.box.com/spout/), and they have a way to install it without composer.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.