PHP根据gps坐标搜索附近

3. define('EARTH_RADIUS', 6370.6935);
5. function vicinity($lng, $lat, $distance = 0.5) {
6. //$distance = 0.5; // 单位 10KM
7. $radius = EARTH_RADIUS;
9. $dlng = rad2deg(2*asin(sin($distance/(2*$radius))/cos($lat)));
10. $dlat = rad2deg($distance*10/$radius);
12. $lng_left = round($lng - $dlng, 6);
13. $lng_right = round($lng + $dlng, 6);
14. $lat_top = round($lat + $dlat, 6);
15. $lat_bottom = round($lat - $dlat, 6);
17. return array('lng'=> array('left'=> $lng_left, 'right'=> $lng_right), 'lat'=> array('top'=> $lat_top, 'bottom'=> $lat_bottom));
18. }

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PHP, gps