distance between two locations in php

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Willis
08 Jun 2018
1<?php
2
3/*::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/
4/*::                                                                         :*/
5/*::  This routine calculates the distance between two points (given the     :*/
6/*::  latitude/longitude of those points). It is being used to calculate     :*/
7/*::  the distance between two locations using GeoDataSource(TM) Products    :*/
8/*::                                                                         :*/
9/*::  Definitions:                                                           :*/
10/*::    South latitudes are negative, east longitudes are positive           :*/
11/*::                                                                         :*/
12/*::  Passed to function:                                                    :*/
13/*::    lat1, lon1 = Latitude and Longitude of point 1 (in decimal degrees)  :*/
14/*::    lat2, lon2 = Latitude and Longitude of point 2 (in decimal degrees)  :*/
15/*::    unit = the unit you desire for results                               :*/
16/*::           where: 'M' is statute miles (default)                         :*/
17/*::                  'K' is kilometers                                      :*/
18/*::                  'N' is nautical miles                                  :*/
19/*::  Worldwide cities and other features databases with latitude longitude  :*/
20/*::  are available at https://www.geodatasource.com                          :*/
21/*::                                                                         :*/
22/*::  For enquiries, please contact sales@geodatasource.com                  :*/
23/*::                                                                         :*/
24/*::  Official Web site: https://www.geodatasource.com                        :*/
25/*::                                                                         :*/
26/*::         GeoDataSource.com (C) All Rights Reserved 2018                  :*/
27/*::                                                                         :*/
28/*::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/
29function distance($lat1, $lon1, $lat2, $lon2, $unit) {
30  if (($lat1 == $lat2) && ($lon1 == $lon2)) {
31    return 0;
32  }
33  else {
34    $theta = $lon1 - $lon2;
35    $dist = sin(deg2rad($lat1)) * sin(deg2rad($lat2)) +  cos(deg2rad($lat1)) * cos(deg2rad($lat2)) * cos(deg2rad($theta));
36    $dist = acos($dist);
37    $dist = rad2deg($dist);
38    $miles = $dist * 60 * 1.1515;
39    $unit = strtoupper($unit);
40
41    if ($unit == "K") {
42      return ($miles * 1.609344);
43    } else if ($unit == "N") {
44      return ($miles * 0.8684);
45    } else {
46      return $miles;
47    }
48  }
49}
50
51echo distance(32.9697, -96.80322, 29.46786, -98.53506, "M") . " Miles<br>";
52echo distance(32.9697, -96.80322, 29.46786, -98.53506, "K") . " Kilometers<br>";
53echo distance(32.9697, -96.80322, 29.46786, -98.53506, "N") . " Nautical Miles<br>";
54
55?>
Karl
17 Oct 2017
1panipat
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