Bagaimana untuk menanyakan orang yang berdekatan dan jarak mereka dalam PHP

Contoh dalam artikel ini menerangkan kaedah pelaksanaan untuk menyoal orang berdekatan dan jarak mereka dalam PHP. Kongsikan dengan semua orang untuk rujukan anda, butirannya adalah seperti berikut:

<?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(&#39;EARTH_RADIUS&#39;, 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);
$squares = array(&#39;left-top&#39;=>array(&#39;lat&#39;=>$lat + $dlat,&#39;lng&#39;=>$lng-$dlng),
        &#39;right-top&#39;=>array(&#39;lat&#39;=>$lat + $dlat, &#39;lng&#39;=>$lng + $dlng),
        &#39;left-bottom&#39;=>array(&#39;lat&#39;=>$lat - $dlat, &#39;lng&#39;=>$lng - $dlng),
        &#39;right-bottom&#39;=>array(&#39;lat&#39;=>$lat - $dlat, &#39;lng&#39;=>$lng + $dlng)
        );
print_r($squares[&#39;left-top&#39;][&#39;lat&#39;]);
//从数库查询匹配的记录
$info_sql = "select * from `A` where lat<>0 and lat>{$squares[&#39;right-bottom&#39;][&#39;lat&#39;]} and lat<{$squares[&#39;left-top&#39;][&#39;lat&#39;]} and lng>{$squares[&#39;left-top&#39;][&#39;lng&#39;]} and lng<{$squares[&#39;right-bottom&#39;][&#39;lng&#39;]} ";
//获取两点之间的距离
function getDistanceBetweenPointsNew($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(&#39;miles&#39;,&#39;feet&#39;,&#39;yards&#39;,&#39;kilometers&#39;,&#39;meters&#39;); 
}
$point1 = array(&#39;lat&#39; => 40.770623, &#39;long&#39; => -73.964367);
$point2 = array(&#39;lat&#39; => 40.758224, &#39;long&#39; => -73.917404);
$distance = getDistanceBetweenPointsNew($point1[&#39;lat&#39;], $point1[&#39;long&#39;], $point2[&#39;lat&#39;], $point2[&#39;long&#39;]);
foreach ($distance as $unit => $value) {
  echo $unit.&#39;: &#39;.number_format($value,4).&#39;<br />&#39;;
}
?>