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How you want to do the grouping is up to you. Maybe look into using Doctrine Collections: https://www.doctrine-project.org/projects/collections.html
Take a look at https://csv.thephpleague.com/. This will make it easy to read in rows using a for loop and insert them into a database.
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.