Show Distance KM between two points in php

<?php
function get_meters_between_points($latitude1, $longitude1, $latitude2, $longitude2) {
if (($latitude1 == $latitude2) && ($longitude1 == $longitude2)) { return 0; }
$p1 = deg2rad($latitude1);
$p2 = deg2rad($latitude2);
$dp = deg2rad($latitude2 - $latitude1);
$dl = deg2rad($longitude2 - $longitude1);
$a = (sin($dp/2) * sin($dp/2)) + (cos($p1) * cos($p2) * sin($dl/2) * sin($dl/2));
$c = 2 * atan2(sqrt($a),sqrt(1-$a));
$r = 6371008; // Earth's average radius, in meters
$d = $r * $c;
return $d; // distance, in meters
}

function get_distance_between_points($latitude1, $longitude1, $latitude2, $longitude2) {
$meters = get_meters_between_points($latitude1, $longitude1, $latitude2, $longitude2);
$kilometers = $meters / 1000;
$miles = $meters / 1609.34;
$yards = $miles * 1760;
$feet = $miles * 5280;
return compact('miles','feet','yards','kilometers','meters');
}
$point1 = array(22.719568, -75.857727);
$point2 = array(28.5355, -77.3910);
$distance = get_distance_between_points($point1['0'], $point1['1'], $point2['0'], $point2['1']);
echo '<p>The two points are '.round($distance['kilometers'],2).' KM apart.</p>';
?>
Reference By: https://inkplant.com/code/calculate-the-distance-between-two-points 

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