atomoc

<?php

function LatLngDist($p, $q) {
    $R = 6371; // Earth radius in km

    $dLat = (($q[0] - $p[0]) * pi() / 180);
    $dLon = (($q[1] - $p[1]) * pi() / 180);
    $a = sin($dLat / 2) * sin($dLat / 2) +
            cos($p[0] * pi() / 180) * cos($q[0] * pi() / 180) *
            sin($dLon / 2) * sin($dLon / 2);