PHP计算2点经纬度之间的距离

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url来源：http://snipplr.com/view/63817/find-distance-between-two-longtudelatitude-in-php/

<?php     header("Content-type: text/html; charset=utf-8");     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 />';      }             // The example returns the following:             // miles: 2.6025       英里    // feet: 13,741.4350   英尺      // yards: 4,580.4783   码（等于3英尺或36英寸或0。9144米）    // kilometers: 4.1884  千米，公里    // meters: 4,188.3894  米 ?>

再这里再解释下:

$point1与$point2是2个点 , lat 代表纬度 , long代表的是经度

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