What's the best practice in modifying/inserting values in specific cells of an existing excel file?

This page summarizes the projects mentioned and recommended in the original post on /r/PHPhelp
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  1. PhpSpreadsheet

    A pure PHP library for reading and writing spreadsheet files

    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.

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  3. Spout

    Discontinued Read and write spreadsheet files (CSV, XLSX and ODS), in a fast and scalable way

    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.

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