Haversine formula with php

Question

I want to use this formula with php. I have a database with some values of latitute and longitude saved.

I want to find, with a certain value of latitude and longit

Answer 1

I making the class of haversign which having the static fuction getDistance having the four paramters and it return the distance from the bot location points

class HaverSign {

     public static function getDistance($latitude1, $longitude1, $latitude2, $longitude2) {
        $earth_radius = 6371;

        $dLat = deg2rad($latitude2 - $latitude1);
        $dLon = deg2rad($longitude2 - $longitude1);

        $a = sin($dLat/2) * sin($dLat/2) + cos(deg2rad($latitude1)) * cos(deg2rad($latitude2)) * sin($dLon/2) * sin($dLon/2);
        $c = 2 * asin(sqrt($a));
        $d = $earth_radius * $c;

        return $d;
}
}

above class is stored at the root directory and root directory contains classes folder Call this by using the following way in any php page

include "../classes/HaverSign.php";
$haversign=new HaverSign();

$lat=18.5204;
$lon=73.8567;

$lat1=18.5404;
$lon1=73.8167;

$dist = $haversign->getDistance($lat,$lon,$lat1,$lon1);
echo $dist;

Output is as follow

4.7676529976827