PHP to calculate the distance between Baidu map coordinates method, PHP coordinates _php tutorial

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

In this paper, we describe the method of calculating the distance between Baidu map coordinates by PHP. Share to everyone for your reference, as follows:

The following is the online code, the use of the time needed to make some changes

The first function is to get the range, the parameter is the latitude longitude radius

The second function is to calculate the coordinate distance

<?phpdefine (' PI ', 3.1415926535898);d efine (' Earth_radius ', 6378.137);//compute range, can do search user function GetRange ($lat, $lon,  $raidus) {//Compute latitude $degree = (24901 * 1609)/360.0;  $dpmLat = 1/$degree;  $radiusLat = $dpmLat * $raidus; $minLat = $lat-$radiusLat; Get the minimum latitude $maxLat = $lat + $radiusLat;  Get maximum latitude//calculate Longitude $mpdLng = $degree * cos ($lat * (pi/180));  $dpmLng = 1/$mpdLng;  $radiusLng = $dpmLng * $raidus; $minLng = $lon-$radiusLng; Get the minimum longitude $maxLng = $lon + $radiusLng; Get the maximum longitude//Range $range = Array (' minlat ' = = $minLat, ' Maxlat ' + $maxLat, ' minlon ' = = $minLng, ' Maxlo  n ' = $maxLng); return $range;}  Get distance between 2 points function getdistance ($lat 1, $lng 1, $lat 2, $lng 2) {$radLat 1 = $lat 1 * (pi/180);  $radLat 2 = $lat 2 * (pi/180);  $a = $radLat 1-$radLat 2;  $b = ($lng 1 * (pi/180))-($lng 2 * (pi/180));  $s = 2 * ASIN (sqrt (Pow (sin ($a/2), 2) + cos ($radLat 1) *cos ($radLat 2) *pow (sin ($b/2), 2)));  $s = $s * earth_radius;  $s = round ($s * 10000)/10000; return $s;}

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