PHP to calculate Baidu map coordinates the distance between the method of Baidu map bus query Baidu Map API Baidu map Route check

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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The above describes the PHP implementation of the calculation of Baidu map coordinates distance between the method, including Baidu map, the method of the content, I hope that the PHP tutorial interested friends have helped.

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