Coordinate distance calculation: PHP calculates the distance between two coordinates

 
 

  
  

  
<?php
  
  

  
Define (' Earth_radius ', 6378.137);//Earth radius
  
  

  
Define (' PI ', 3.1415926);
  
  

  
/**
  
  

  
* Calculate the distance between the two sets of latitude coordinates
  
  

  
* PARAMS:LAT1 latitude 1; lng1 longitude 1; lat2 latitude 2; lng2 longitude 2; Len_type (1:m or 2:km);
  
  

  
* Return m or km
  
  

  
*/
  
  

  
function Getdistance ($lat 1, $lng 1, $lat 2, $lng 2, $len _type = 1, $decimal = 2)
  
  

  
{
  
  

  
$radLat 1 = $lat 1 * pi/180.0;
  
  

  
$radLat 2 = $lat 2 * pi/180.0;
  
  

  
$a = $radLat 1-$radLat 2;
  
  

  
$b = ($lng 1 * pi/180.0)-($lng 2 * pi/180.0);
  
  

  
$s = 2 * ASIN (SQRT (POW) (sin ($a/2), 2) + cos ($radLat 1) * cos ($radLat 2) * POW (sin ($b/2), 2));
  
  

  
$s = $s * earth_radius;
  
  

  
$s = round ($s * 1000);
  
  

  
if ($len _type > 1)
  
  

  
{
  
  

  
$s/= 1000;
  
  

  
}
  
  

  
Return round ($s, $decimal);
  
  

  
}
  
  

  
Echo getdistance (39.908156,116.4767, 39.908452, 116.450479, 1);//output distance/m
 
 

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