How to determine by GPS coordinates whether a point is outside the Moscow Ring Road?

Question

PHP

Hello.
Are there ready-made solutions, scripts for determining by GPS coordinate - is it located outside the Moscow Ring Road or not?
I'm looking for a solution in PHP, but maybe there is something in other languages.

Answer 1

How to select a Yandex.map zone based on the user's address?
There is an example of checking the occurrence of a point in a polygon.

Answer 2

Banal "checking the occurrence of a point in a polygon."