frostybee / geobee

A simple, stand-alone PHP library for calculating the distance between geographical coordinates.

Geobee

A standalone PHP library for calculating the distance between geographical coordinates.

Installation

This library requires no dependencies.

To install it:

• Clone this repository.
• Or use composer: composer require frostybee/geobee

Units of Lengths

The following are the supported units of lengths along with their respective conversion factors:

• m - Meters (default)
• km - kilometers (1km = 1000 meters)
• mi - Miles (1mi = 1609.344 meters)
• nm - Nautical miles (1nm = 1852 meters)
• yd - Yards (1yd = 0.9144)
• ft - Feet (1ft = 0.3048 meters)

Usage

Using this library is simple and straightforward. Just instantiate the Calculator class and supply two pairs of latitude/longitude to the calculate() method as shown below.

<?php

use Frostybee\Geobee\Calculator;

/*
 * Calculate the distance from downtown Montreal to Laval.
 * From: Ville-Marie 
 *       postal code area: H3A
 *       Latitude/Longitude: 45.4987, -73.5703
 * To: Laval 
 *     postal code area: H7T 
 *     Latitude/Longitude: 45.55690, -73.7480
 */
$calculator = new Calculator();
$distance = $calculator->calculate(
    $from_latitude,
    $from_longitude,
    $to_latitude,
    $to_longitude
)->getDistance(); // Distance in meters.

Converting the Distance from Meters to other Units

Single Conversion

Use the to() method as show below. However, you must call the calculate() method once before doing any conversions.

$distance = $calculator->calculate(
    $from_latitude,
    $from_longitude,
    $to_latitude,
    $to_longitude
)->to('km'); // Get the distance in kilometers.

Or:

$distance = $calculator->to('mi', 3, false);

Multiple Conversions

1. Use the toMany() method to convert the distance from meters to many (one or more) units of lengths:

// $calculator->toMany(array, $decimals, $round);
$results = $calculator->toMany(['km', 'mi'], 3, true);

The above call returns an associative array structured as follows:

array(2) {
  ["km"]=>
  float(15.298)
  ["mi"]=>
  float(9.506)
}

2. Convert to all supported length units.

//$calculator->toAll($decimals, $round);
$results = $calculator->toAll(2, true);

output:

array(6) {
  ["m"]=>
  float(15297.83)
  ["km"]=>
  float(15.3)
  ["ft"]=>
  float(50189.72)
  ["yd"]=>
  float(16729.91)
  ["mi"]=>
  float(9.51)
  ["nm"]=>
  float(8.26)
}