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@samir
Created December 9, 2010 04:04
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Distance between two coordinates (latitude/longitude) in PHP
function distance($lat1 = 0, $lng1 = 0, $lat2 = 0, $lng2 = 0, $miles = true)
{
$pi80 = M_PI / 180;
$lat1 *= $pi80;
$lng1 *= $pi80;
$lat2 *= $pi80;
$lng2 *= $pi80;
$r = 6372.797; // mean radius of Earth in km
$dlat = $lat2 - $lat1;
$dlng = $lng2 - $lng1;
$a = sin($dlat / 2) * sin($dlat / 2) + cos($lat1) * cos($lat2) * sin($dlng / 2) * sin($dlng / 2);
$c = 2 * atan2(sqrt($a), sqrt(1 - $a));
$km = $r * $c;
return ($miles ? ($km * 0.621371192) : $km);
}
# Source: http://snipplr.com/view/2531/calculate-the-distance-between-two-coordinates-latitude-longitude/
# Reference for others languages: http://www.codecodex.com/wiki/Calculate_distance_between_two_points_on_a_globe
@alphasypher
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please i am new to programming
please, where do i insert the two coordinates and how do i see the results. a working example will go a long way. thanks.

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