<?php
//中国正常GCJ02坐标---->百度地图BD09坐标
function Convert_GCJ02_To_BD09($lat,$lng){

    $x_pi = 3.14159265358979324 * 3000.0 / 180.0;

    $x = $lng;

    $y = $lat;

    $z =sqrt($x * $x + $y * $y) + 0.00002 * sin($y * $x_pi);

    $theta = atan2($y, $x) + 0.000003 * cos($x * $x_pi);

    $lng = $z * cos($theta) + 0.0065;

    $lat = $z * sin($theta) + 0.006;

    return array('lng'=>$lng,'lat'=>$lat);

}
//百度地图BD09坐标---->中国正常GCJ02坐标

//腾讯地图用的也是GCJ02坐标
function Convert_BD09_To_GCJ02($lat,$lng){

    $x_pi = 3.14159265358979324 * 3000.0 / 180.0;

    $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);

    $lng = $z * cos($theta);

    $lat = $z * sin($theta);

    return array('lng'=>$lng,'lat'=>$lat);

}

?>