Get Distance Between Two Lat Long

Create function to calculate distance. and pass lat long of first place and second place. and one parameter for the distance type.

function calculateDistance($lat1,$lng1,$lat2,$lng2,$miles = true)
{
    $pi80 = M_PI / 180;
    $lat1 *= $pi80;
    $lng1 *= $pi80;
    $lat2 *= $pi80;
    $lng2 *= $pi80;

    $r = 6372.797; // mean radius of Earth in km
    $dlat = $lat2 - $lat1;
    $dlng = $lng2 - $lng1;
    $a = sin($dlat / 2) * sin($dlat / 2) + cos($lat1) * cos($lat2) * sin($dlng / 2) * sin($dlng / 2);
    $c = 2 * atan2(sqrt($a), sqrt(1 - $a));
    $km = $r * $c;
 
    return ($miles ? ($km * 0.621371192) : $km);
}

Function Call:

$data['d_dist'] = calculateDistance((double)($cur_lat),(double)($cur_lon),(double)($lat2),(double)($lon2),false);

Pass false to get distance in km.


Option 2(sort function):

function calculateDistance($lat1, $lng1, $lat2, $lon2) {
$distance = (3958*3.1415926*sqrt(($lat2-$lat1)*($lat2-$lat1) + cos($lat2/57.29578)*cos($lat1/57.29578)*($lon2-$lng1)*($lon2-$lng1))/180);
return $distance; // Distance calculated in miles
}