Finding the distance between two points : Float « Data Type « PHP






  1. PHP
  2. Data Type
  3. Float

Finding the distance between two points

 
<?php
function sphere_distance($lat1, $lon1, $lat2, $lon2, $radius = 6378.135) {
    $rad = doubleval(M_PI/180.0);
    
    $lat1 = doubleval($lat1) * $rad;
    $lon1 = doubleval($lon1) * $rad; 
    $lat2 = doubleval($lat2) * $rad;
    $lon2 = doubleval($lon2) * $rad;
    
    $theta = $lon2 - $lon1;
    $dist = acos(sin($lat1) * sin($lat2) + cos($lat1) * cos($lat2) * cos($theta));
    if ($dist < 0) { $dist += M_PI; }

    return $dist = $dist * $radius;
}

$lat1 = 40.;
$lon1 = -50.;

$lat2 = 37;
$lon2 = -122;

$dist = sphere_distance($lat1, $lon1, $lat2, $lon2);
printf("%.2f\n", $dist * 0.621);
?>








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