思路：

查询某个点附近的东西，例如查询当前位置周围5千米的酒店，

遍历数据库所有的酒店，取出经度纬度，放入二维数组。分别带入getDistanceBetweenPointNew(),取出一个值，即距离米，查询的时候距离小于5千米的都查询出来。

<?php
 
//获取该点周围的4个点
 
$distance = 1;//范围（单位千米）
 
$lat = 113.873643;
 
$lng = 22.573969;
 
define('EARTH_RADIUS', 6371);//地球半径，平均半径为6371km
 
$dlng = 2 * asin(sin($distance / (2 * EARTH_RADIUS)) / cos(deg2rad($lat)));
 
$dlng = rad2deg($dlng);
 
$dlat = $distance/EARTH_RADIUS;
 
$dlat = rad2deg($dlat);
 
$squares = array('left-top'=>array('lat'=>$lat + $dlat,'lng'=>$lng-$dlng),
 
        'right-top'=>array('lat'=>$lat + $dlat, 'lng'=>$lng + $dlng),
 
        'left-bottom'=>array('lat'=>$lat - $dlat, 'lng'=>$lng - $dlng),
 
        'right-bottom'=>array('lat'=>$lat - $dlat, 'lng'=>$lng + $dlng)
 
        );
 
print_r($squares['left-top']['lat']);
 
//从数库查询匹配的记录
 
$info_sql = "select * from `A` where lat<>0 and lat>{$squares['right-bottom']['lat']} and lat<{$squares['left-top']['lat']} and lng>{$squares['left-top']['lng']} and lng<{$squares['right-bottom']['lng']} ";
 
//获取两点之间的距离
 
function getDistanceBetweenPointsNew($latitude1, $longitude1, $latitude2, $longitude2) {
 
  $theta = $longitude1 - $longitude2;
 
  $miles = (sin(deg2rad($latitude1)) * sin(deg2rad($latitude2))) + (cos(deg2rad($latitude1)) * cos(deg2rad($latitude2)) * cos(deg2rad($theta)));
 
  $miles = acos($miles);
 
  $miles = rad2deg($miles);
 
  $miles = $miles * 60 * 1.1515;
 
  $feet = $miles * 5280;
 
  $yards = $feet / 3;
 
  $kilometers = $miles * 1.609344;
 
  $meters = $kilometers * 1000;
 
  return compact('miles','feet','yards','kilometers','meters'); 
 
}
 
$point1 = array('lat' => 40.770623, 'long' => -73.964367);
 
$point2 = array('lat' => 40.758224, 'long' => -73.917404);
 
$distance = getDistanceBetweenPointsNew($point1['lat'], $point1['long'], $point2['lat'], $point2['long']);
 
foreach ($distance as $unit => $value) {
 
  echo $unit.': '.number_format($value,4).'<br />';
 
}
 
?>
 

SELECT
*,(
        6371 * acos(
            cos(radians(纬度)) * cos(radians(lat)) * cos(
                radians(lng) - radians(经度)
            ) + sin(radians(纬度)) * sin(radians(lat))
        )
    ) AS distance
FROM
    acc_sys_t_city2

having distance <5
ORDER BY
    distance
LIMIT 0,
 50;

其中，radians()是mysql的函数，可以换成deg2rad（），这个是php 的函数，意思是角度转成弧度。