Because my other question wasn't successful (How to extend polygon by a certain distance in PHP/Mysql?), I'm thinking to find a simpler solution.
I have a table of places (defined by lat and lng) and a table of locations (polygons stored as geometry). What I need is to search for records in mysql within polygon + certain radius (e.g. 1/4 miles).
There is the function ST_Centroid for getting the center point of polygon but how to get the distance between the center point and the furthest point in order to get extended radius of the circle?
