php 百度地图经纬度转腾讯地图经纬度

源代码

/**
     * 百度地图经纬度转腾讯地图经纬度
     * @param $lat
     * @param $lon
     * @return string
     */
    public function map_bd2tx($lat, $lon)
    {
        $tx_lat = 0;
        $tx_lon = 0;
        $x_pi = 3.14159265358979324;
        $x = $lon - 0.0065;
        $y = $lat - 0.006;
//Math
        $z = sqrt($x * $x + $y * $y) - 0.00002 * sin($y * $x_pi);
        $theta = atan2($y, $x) - 0.000003 * cos($x * $x_pi);
        $tx_lon = $z * cos($theta);
        $tx_lat = $z * sin($theta);
        return $tx_lat . "," . $tx_lon;
    }