How to use longitude and latitude in php to calculate the distance between two points (pure code)

The content of this article is about how PHP uses longitude and latitude to calculate the distance between two points (pure code). It has certain reference value. Friends in need can refer to it. I hope it will be useful to you. Helps.

function rad($d)
{
       return $d * 3.1415926535898 / 180.0;
}
function GetDistance($lat1, $lng1, $lat2, $lng2)
{
    $EARTH_RADIUS = 6378.137;
    $radLat1 = rad($lat1);
   $radLat2 = rad($lat2);
   $a = $radLat1 - $radLat2;
   $b = rad($lng1) - rad($lng2);
   $s = 2 * asin(sqrt(pow(sin($a/2),2) +
    cos($radLat1)*cos($radLat2)*pow(sin($b/2),2)));
   $s = $s *$EARTH_RADIUS;
   $s = round($s * 10000) / 10000;
   return $s;
}

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