MySQL function to calculate the distance between two latitude and latitude GPS pairs

By | April 10, 2014
CREATE DEFINER=`root`@`localhost` FUNCTION `FIND_DISTANCE`(`src_latitude` float,`src_longitude` float, `dest_latitude` float,`dest_longitude` float) RETURNS int(11)
	This function takes four parameterss, two sets of latitude and latitude pairs and returns the distance between them in miles.

  Example use
  SELECT * , FIND_DISTANCE(home_latitude, home_longitude, 52.5, -1) AS distance FROM users WHERE deleted = 0;
	RETURN ( 3959 * acos( cos( radians(src_latitude) ) * cos( radians( dest_latitude ) ) * cos( radians(dest_longitude) - radians(src_longitude)) + sin(radians(src_latitude)) * sin( radians(dest_latitude))));


Uses Haversine formula

Independently verified result metric to me miles by using with the same coordinates. Distance on that site is shown as KM, but converting to miles resulted in the same result as this function.