<?php
$gps1 = new Dy\Map(121.468189122, 31.1526609317, 0); // var_dump($gps1);
var_dump($gps1->gcj02());
var_dump($gps1->gcj02()->wgs84());
var_dump($gps1->wgs84());
var_dump($gps1->bd09());
// echo($gps1->lng);

$gps2 = new Dy\Map(122.478189122, 31.1576609317, 2);
echo $gps1->distance($gps2);