计算两个经纬度间的距离

<?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 />';  
}  
?>  

看到后觉得不错就拿来了,尊重作者:http://blog.csdn.net/phpfenghuo/article/details/46455729