PHP版根据经纬度和半径计算出经纬度的范围

/**
* @param lat 纬度 lon 经度 raidus 单位米
* return minLat,minLng,maxLat,maxLng
*/

public function getAround($lat,$lon,$raidus){
$PI = 3.14159265;

$latitude = $lat;
$longitude = $lon;

$degree = (24901*1609)/360.0;
$raidusMile = $raidus;

$dpmLat = 1/$degree;
$radiusLat = $dpmLat*$raidusMile;
$minLat = $latitude – $radiusLat;
$maxLat = $latitude + $radiusLat;

$mpdLng = $degree*cos($latitude * ($PI/180));
$dpmLng = 1 / $mpdLng;
$radiusLng = $dpmLng*$raidusMile;
$minLng = $longitude – $radiusLng;
$maxLng = $longitude + $radiusLng;
echo $minLat.”#”.$maxLat.”@”.$minLng.”#”.$maxLng;
}