Calculate distance between two points

geo.php

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).'<br />';
}

Query : distance

<?php

// Permet d'obtenir les entrés contenu dans un rayon ($within)
$latitude = 45.545421; 
$longitude = -73.59288; 
$within = 100;

$query = "
SELECT `zip_code`, (6371 * acos(cos(radians($latitude)) * cos(radians(`lat`)) * cos(radians(`long`) - radians($longitude)) + sin(radians($latitude)) * sin(radians(`lat`))))
AS `distance`
FROM `places`
HAVING `distance` < $within
ORDER BY `distance` ASC
LIMIT 10;";

?>