How to group objects based on longitude/latitude proximity using laravel/php

I have a group of users. The user count could be 50 or could be 2000. Each should have a long/lat that I have retrieved from Google Geo api.

I need to query them all, and group them by proximity and a certain count. Say the count is 12 and I have 120 users in the group. I want to group people by how close they are (long/lat) to other people. So that I wind up with 10 groups of people who are close in proximity.

I currently have the google geo coding api setup and would prefer to use that.

TIA.

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