PHP計算兩點經緯度之間的距離代碼

以下是對PHP計算2點經緯度之間的距離代碼進行了分析介紹

    <?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 />';  
}  
?>  </pre>