#haversine A simple PHP helper class that utilises the haversine formula to determine the distance between two passed latitude/longitude locations.

If you need a distance from point A to point B on a sphere this is the perfect starting point.

By default this class defaults to the radius of the earth in kilometres.

Simply include the haversine.php class:

include 'haversine.php';

Instantiate your object:

$objHaversine = new Haversine;

Call the getDistance() method, passing to it four arguments:

$objHaversine->getDistance($startLat, $startLong, $endLat, $endLong);

Although this helper class is not really designed to be used directly with any user input I have created a simple demo file (demo.php) to test the formula.