PHP code to calculate the distance between two points longitude and latitude

The following is an analysis and introduction to the PHP code for calculating the distance between 2 points of longitude and latitude

  function getDistanceBetweenPointsNew($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');
 }

 $point1 = array('lat' => 40.770623, 'long' => -73.964367);
 $point2 = array('lat' => 40.758224, 'long' => -73.917404);
 $ distance = getDistanceBetweenPointsNew($point1['lat'], $point1['long'], $point2['lat'], $point2['long']);
 foreach ($distance as $unit => $value ) {
 echo $unit.': '.number_format($value,4).'';
 }
 ?>

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