PHP implements the method of calculating the distance between Baidu map coordinates, PHP coordinates_PHP tutorial

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

<&#63;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;
}

Readers who are interested in more PHP-related content can check out the special topics on this site: "Complete PHP Array Operation Skills", "Summary of PHP Mathematical Operation Skills", "Summary of PHP Regular Expression Usage", "PHP ajax" Summary of Skills and Applications", "Summary of PHP Operations and Operator Usage", "Summary of PHP Network Programming Skills", "Introduction Tutorial on PHP Basic Syntax", "Summary of PHP Date and Time Usage", "Introduction Tutorial on PHP Object-Oriented Programming" , "php string (string) usage summary", "php mysql database operation introductory tutorial" and "php common database operation skills summary"

I hope this article will be helpful to everyone in PHP programming.

http://www.bkjia.com/PHPjc/1123805.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/1123805.htmlTechArticlephp method for calculating the distance between Baidu map coordinates, php coordinates This article describes the php method for calculating Baidu map coordinates distance method. Share it with everyone for your reference, specifically...