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Contract Killer

The popular open-source contract for web designers and developers by Stuff & Nonsense

  • Originally published: 23/12/2008
  • Revised date: 15/12/2013
  • Original post

<?php
function distance($lat1, $lng1, $lat2, $lng2)
{
// convert latitude/longitude degrees for both coordinates
// to radians: radian = degree * π / 180
$lat1 = deg2rad($lat1);
$lng1 = deg2rad($lng1);
$lat2 = deg2rad($lat2);
$lng2 = deg2rad($lng2);