Added polar-separation test, which checks the optional radius parameter to the haversin function.

Author: manarth

tests/geospatial_haversine_polar_distance.phpt

@@ -0,0 +1,17 @@
+--TEST--
+Check the haversine function returns the correct distance between the North and South poles, using a custom radius.
+--SKIPIF--
+<?php if (!extension_loaded("geospatial")) print "skip"; ?>
+--FILE--
+<?php 
+echo haversine(90, 0, -90, 0, 6356.7523);
+/*
+	Test the haversine distance between the North and South poles.
+
+	Accept defined (equatorial) Earth Radius in km (which is based on WGS-84):
+	- 6,378,1370m (at the equator).
+	- 6,356,7523m (at the equator).
+*/
+?>
+--EXPECT--
+19970.32632637