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PHP implements the method of calculating the distance between Baidu map coordinates, PHP coordinates_PHP tutorial
- WBOYOriginal
- 2016-07-12 08:53:39712browse
php implements the method of calculating the distance between Baidu map coordinates, php coordinates
This article describes the example of php implementing the method of calculating the distance between Baidu map coordinates. Share it with everyone for your reference, the details are as follows:
The following is the code on the Internet, you need to make some modifications when using it
The first function is to obtain the range, the parameters are latitude, longitude and radius
The second function is to calculate the coordinate distance
<?php
define('PI',3.1415926535898);
define('EARTH_RADIUS',6378.137);
//计算范围，可以做搜索用户
function GetRange($lat,$lon,$raidus){
//计算纬度
$degree = (24901 * 1609) / 360.0;
$dpmLat = 1 / $degree;
$radiusLat = $dpmLat * $raidus;
$minLat = $lat - $radiusLat; //得到最小纬度
$maxLat = $lat + $radiusLat; //得到最大纬度
//计算经度
$mpdLng = $degree * cos($lat * (PI / 180));
$dpmLng = 1 / $mpdLng;
$radiusLng = $dpmLng * $raidus;
$minLng = $lon - $radiusLng; //得到最小经度
$maxLng = $lon + $radiusLng; //得到最大经度
//范围
$range = array(
'minLat' => $minLat,
'maxLat' => $maxLat,
'minLon' => $minLng,
'maxLon' => $maxLng
);
return $range;
}
//获取2点之间的距离
function GetDistance($lat1, $lng1, $lat2, $lng2){
$radLat1 = $lat1 * (PI / 180);
$radLat2 = $lat2 * (PI / 180);
$a = $radLat1 - $radLat2;
$b = ($lng1 * (PI / 180)) - ($lng2 * (PI / 180));
$s = 2 * asin(sqrt(pow(sin($a/2),2) + cos($radLat1)*cos($radLat2)*pow(sin($b/2),2)));
$s = $s * EARTH_RADIUS;
$s = round($s * 10000) / 10000;
return $s;
}
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