adding a static 1km grid to google maps using php

I want to create a grid that I’ll be overlaying google maps.
The grid has to be static, meaning 1km² grid has to be exactly at the same location and has to be identifiable with a unique id.
How can I achieve this in google maps and php?

The best,
redshark1802

edit: Forgot to mention that I have to interact with these grids direclty, meaning changing color/style for each field.
I’ve found some site that did it already https://ownthisworld.com/

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