PHP method to calculate the distance between Baidu map coordinates_php skills

the example in this article describes the method of calculating the distance between baidu map coordinates in php. 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 parameter is the 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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