php - How to detect if a marker is inside a polygon in google maps

Question

I've got loads of coordinates for a polygon in a database. I also have coordinates for an marker in my database. How do i detect if the marker is inside this polyon.

Note: I use a cronjob to move the marker, and in this cronjob it needs to detect this. So javascript isn't involved!

Shape of polygon is not just a circle or square. It could be for example a country or sea.

Answer 1

There is now a function in the Google Map API that does that.

Google Map coordinates in polygon

containsLocation(point:LatLng, polygon:Polygon);    
isLocationOnEdge(point:LatLng, poly:Polygon|Polyline, tolerance?:number);