记录一次使用php实现GCJ02与百度BD09互转的代码

        $x_PI = 3.14159265358979324 * 3000.0 / 180.0;
        $PI = 3.1415926535897932384626;
        $a = 6378245.0;
        $ee = 0.00669342162296594323;
        $z = sqrt($lng * $lng + $lat * $lat) + 0.00002 * sin($lat * $x_PI);
        $theta = atan2($lat, $lng) + 0.000003 * cos($lng * $x_PI);
        $bd_lng = $z * cos($theta) + 0.0065;
        $bd_lat = $z * sin($theta) + 0.006;
        return array($bd_lng,$bd_lat);//输入经纬度
    }
    var_dump(transformGCJ02ToBD09($lng,$lat));
    //百度坐标（BD09）转 GCJ02
     function transformBD09ToGCJ02($lng,$lat) {
         $x_PI = 3.14159265358979324 * 3000.0 / 180.0;
        $PI = 3.1415926535897932384626;
        $a = 6378245.0;
        $ee = 0.00669342162296594323;
        $x = $lng - 0.0065;
        $y = $lat - 0.006;
        $z = sqrt($x * $x + $y * $y) - 0.00002 * sin($y * $x_PI);
        $theta = atan2($y, $x) - 0.000003 * cos($x * $x_PI);
        $gcj_lng = $z * cos($theta);
        $gcj_lat = $z * sin($theta);
        return array($gcj_lng, $gcj_lat);
    }
    var_dump(transformBD09ToGCJ02($lng,$lat));//输入经纬度在这里插入代码片