Calculate distance between 2 geographical points

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Credits and Source: http://www.roscripts.com/

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Name: Calculate distance between 2 geographical points
Description: This simple function will return the distance in Km or Miles between 2 points given their latitude/longitude in degrees.
Snippet:

PHP Code:

<?php
function getDistance($a_lat,$a_lng,$b_lat,$b_lng,$mi=false){
    var $radius;
    ($mi ? $radius=10253 : $radius=6371);
    $a_lat = deg2rad($a_lat);
    $a_lng = deg2rad($a_lng);
    $b_lat = deg2rad($b_lat);
    $b_lng = deg2rad($b_lng);
    if($a_lat==$b_lat && $a_lng==$b_lng) return 0;
    if ((sin($b_lat)*sin($a_lat ) + cos($b_lat)*cos($a_lat )*cos($b_lng-$a_lng))>1)
        return $radius * acos(1));
     return $radius * acos(sin($b_lat)*sin($a_lat)+cos($b_lat)*cos($a_lat)*cos($b_lng-$a_lng)));
}
?>

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