How to get distance between two points ?

Following function calculates the distance between two points (given the latitude/longitude coordinates of those points).
The calculated distance can be shown in following units.

• Miles
• Nautical Miles
• Kilometeres
• Meters
• Yards
• Feet
• Inches

Here is the function to calculate distance between two points :-

/**
 * Get distancce between two points.
 * eg.:-
 $point1 = array('lat' => 40.770623, 'long' => -73.964367);
 $point2 = array('lat' => 40.758224, 'long' => -73.917404);
 $distance = getDistanceBetweenPoints($point1['lat'], $point1['long'], $point2['lat'], $point2['long']);
 foreach ($distance as $unit => $value) {
    echo $unit.': '.number_format($value,4).'';
 }
 */
function getDistanceBetweenPoints($latitude1, $longitude1, $latitude2, $longitude2)
{
    $theta = $longitude1 - $longitude2;
    $miles = (sin(deg2rad($latitude1)) * sin(deg2rad($latitude2))) + (cos(deg2rad($latitude1)) * cos(deg2rad($latitude2)) * cos(deg2rad($theta)));
    $miles = acos($miles);
    $miles = rad2deg($miles);
    $miles = $miles * 60 * 1.1515;
    $feet = $miles * 5280;
    $yards = $feet / 3;
    $kilometers = $miles * 1.609344;
    $meters = $kilometers * 1000;
    return compact('miles','feet','yards','kilometers','meters');
}

See example placed at above function.

Have Fun!