gps 搜索附近坐标

无详细内容 无 ?phpdefine('EARTH_RADIUS', 6370.6935);function vicinity($lng, $lat, $distance = 5) {//$distance = 5;// 单位 1KM$radius = EARTH_RADIUS;$dlng = abs(rad2deg(2*asin(sin($distance/(2*$radius))/cos($lat))));$dlat = abs(rad2deg($dist

<?php

define('EARTH_RADIUS', 6370.6935);

function vicinity($lng, $lat, $distance = 5) {
	//$distance = 5;		// 单位 1KM
	$radius = EARTH_RADIUS;
	
	$dlng = abs(rad2deg(2*asin(sin($distance/(2*$radius))/cos($lat))));
	$dlat = abs(rad2deg($distance/$radius));

	$lng_left = round($lng - $dlng, 6);
	$lng_right = round($lng + $dlng, 6);
	$lat_top = round($lat + $dlat, 6);
	$lat_bottom = round($lat - $dlat, 6);
	
	return array('lng'=> array('left'=> $lng_left, 'right'=> $lng_right), 'lat'=> array('top'=> $lat_top, 'bottom'=> $lat_bottom));
}