地球坐标，火星坐标，百度坐标转换的php实现

<?php

class Coordinate
{
public  $x = 0;//lat
public  $y = 0; // lng
public  $z = 0; // other

function __construct($lat,$lng)
{
$this->x = $lat;
$this->y = $lng;
}
}
?>

<?php

require 'Coordinate.class.php';
define('X_PI',3.14159265358979324*3000.0/180.0);

class GeoTransUtil
{
private static $x_pi = X_PI;
private static $pi = 3.14159265358979324;
private static $a = 6378245.0;
private static $ee = 0.00669342162296594323;

//火星坐标(GCJ02坐标，高德，谷歌，腾讯坐标)到百度坐标BD-09
public static function gcjTObd($from){
$to = new Coordinate();
$x = $from->y;
$y = $from->x;
$z = sqrt($x * $x + $y * $y) + 0.00002 * sin($y * self::$x_pi);
$theta = atan2($y, $x) + 0.000003 * cos($x * self::$x_pi);
$to->y = $z * cos($theta) + 0.0065;
$to->x = $z * sin($theta) + 0.006;

return ($to);
}

//百度坐标BD-09到火星坐标GCJ02(高德，谷歌，腾讯坐标)
public static function bdTOgcj($from){
$to = new Coordinate();
$x = $from->y - 0.0065;
$y = $from->x - 0.006;
$z = sqrt($x * $x + $y * $y) - 0.00002 * sin($y * self::$x_pi);
$theta = atan2($y, $x) - 0.000003 * cos($x * self::$x_pi);
$to->y = $z * cos($theta);
$to->x = $z * sin($theta);
return ($to);
}

// WGS-84(GPS坐标，谷歌地球坐标) 到 GCJ-02(火星坐标) 的转换
public static function wgsTOgcj($from){
//double wgLat, double wgLon, out double mgLat, out double mgLon
$wgLat = $from->x;
$wgLon = $from->y;
if (self::outOfChina($wgLat, $wgLon)){
return (new Coordinate($wgLat, $wgLon));
}

$dLat = GeoTransUtil::transformLat($wgLon - 105.0, $wgLat - 35.0);
$dLon = GeoTransUtil::transformLon($wgLon - 105.0, $wgLat - 35.0);
$radLat = $wgLat / 180.0 * self::$pi;
$magic = sin($radLat);
$magic = 1 - self::$ee * $magic * $magic;
$sqrtMagic = sqrt($magic);
$dLat = ($dLat * 180.0) / ((self::$a * (1 - self::$ee)) / ($magic * $sqrtMagic) * self::$pi);
$dLon = ($dLon * 180.0) / (self::$a / $sqrtMagic * cos($radLat) * self::$pi);

$mgLat = $wgLat + $dLat;
$mgLon = $wgLon + $dLon;

return (new Coordinate($mgLat, $mgLon));
}

// GCJ-02 到 WGS-84 的转换
public static function gcjTOwgs($from){
$to = self::wgsTOgcj($from);
$lat = $from->x;
$lon = $from->y;
$g_lat = $to->x;
$g_lon = $to->y;
$d_lat = $g_lat - $lat;
$d_lon = $g_lon - $lon;

return new Coordinate($lat - $d_lat, $lon - $d_lon);
}

/ //把地球经纬度转换为lat和lng
public static function earthCoordinate($t1, $t2) {
$tt1 = $t1->x + $t1->y/60.0 + $t1->z/3600.0;
$tt2 = $t2->x + $t2->y/60.0 + $t2->z/3600.0;

return (new Coordinate($tt1, $tt2));
}

private static function outOfChina($lat,$lon)
{
if ($lon < 72.004 || $lon > 137.8347)
return true;
if ($lat < 0.8293 || $lat > 55.8271)
return true;

return false;
}

private static function transformLat($x,$y)
{
$ret = -100.0 + 2.0 * $x + 3.0 * $y + 0.2 * $y * $y + 0.1 * $x * $y + 0.2 * sqrt(abs($x));
$ret += (20.0 * sin(6.0 * $x * self::$pi) + 20.0 * sin(2.0 * $x * self::$pi)) * 2.0 / 3.0;
$ret += (20.0 * sin($y * self::$pi) + 40.0 * sin($y / 3.0 * self::$pi)) * 2.0 / 3.0;
$ret += (160.0 * sin($y / 12.0 * self::$pi) + 320 * sin($y * self::$pi / 30.0)) * 2.0 / 3.0;
return $ret;
}

private static function transformLon($x, $y)
{
$ret = 300.0 + $x + 2.0 * $y + 0.1 * $x * $x + 0.1 * $x * $y + 0.1 * sqrt(abs($x));
$ret += (20.0 * sin(6.0 * $x * self::$pi) + 20.0 * sin(2.0 * $x * self::$pi)) * 2.0 / 3.0;
$ret += (20.0 * sin($x * self::$pi) + 40.0 * sin($x / 3.0 * self::$pi)) * 2.0 / 3.0;
$ret += (150.0 * sin($x / 12.0 * self::$pi) + 300.0 * sin($x / 30.0 * self::$pi)) * 2.0 / 3.0;
return $ret;
}

}

?>

<?php

require 'GeoTransUtil.class.php';

$from = new Coordinate(55.8271, 137.8345);

$ret = GeoTransUtil::wgsTOgcj($from);
echo '</br>';
echo $ret->x.','.$ret->y;
?>