PHP查询附近的人及其距离的实现方法_PHP教程

PHP查询附近的人及其距离的实现方法

2021-01-17 21:01果冻空间 PHP教程

这篇文章主要介绍了PHP查询附近的人及其距离的实现方法,涉及php数学运算的相关技巧,具有一定参考借鉴价值,需要的朋友可以参考下

本文实例讲述了PHP查询附近的人及其距离的实现方法。分享给大家供大家参考，具体如下：

									<?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 />';

									}

									?>