[html] PHP使用Google map web services来计算两点间的距离 Compute the distance between two place via Google map services in PHP

Below is PHP code:

function distance($lat1, $lng1, $lat2, $lng2)
    {
        $url = "http://maps.google.com/maps/api/directions/xml?origin=".$lat1.",".$lng1."&destination=".$lat2.",".$lng2."&sensor=false";
        $tem = simplexml_load_file($url);
        $tem->registerXPathNamespace("tem", "http://www.w3.org/2005/Atom");
        $rs = 0;
        for($i = 0; $i<count($tem->route->leg->step); $i++)
        {
            $rs += $tem->route->leg->step[$i]->distance->value;
        }
        return $rs;
    }