以下是对PHP计算2点经纬度之间的距离代码进行了分析介绍

    <?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 />';  
    }  
    ?>