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otakupahp/distance.php

Last active May 20, 2022 09:23
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Calculate distance between 2 locations
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distance.php
<?php
/**
* Calculate the distance between the 2 locations
*
* @param array $point_a
* @param array $point_b
*
* @return float
*/
function calculate_distance( array $point_a, array $point_b ) : float {
$theta = $point_a['longitude'] - $point_b['longitude'];
$point_a_rad_lat = deg2rad( $point_a['latitude'] );
$point_b_rad_lat = deg2rad( $point_b['latitude'] );
$dist =
( sin( $point_a_rad_lat ) * sin( $point_b_rad_lat ) ) +
( cos( $point_a_rad_lat ) * cos( $point_b_rad_lat ) * cos( deg2rad( $theta ) ) );
$dist = rad2deg ( acos( $dist ) );
return $dist * 60 * 1.1515;
}
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