PHP Math Exercises : Get the distance between two points on the earth

Last update on May 30 2022 11:49:42 (UTC/GMT +8 hours)

PHP math: Exercise-12 with Solution

Write a PHP function to get the distance between two points on the earth.

Pictorial Presentation:

$PHP Math Exercises: Get the distance between two points on the earth$

Sample Solution:

PHP Code:

<?php
function lat_long_dist_of_two_points($latitudeFrom, $longitudeFrom, $latitudeTo, $longitudeTo){ 
$pi = pi(); 
$x = sin($latitudeFrom * $pi/180) * 
sin($latitudeTo * $pi/180) + 
cos($latitudeFrom * $pi/180) * 
cos($latitudeTo * $pi/180) * 
cos(($longitudeTo * $pi/180) - ($longitudeFrom * $pi/180)); 
$x = atan((sqrt(1 - pow($x, 2))) / $x); 
return abs((1.852 * 60.0 * (($x/$pi) * 180)) / 1.609344); 
} 
// Distance from New York to London
echo lat_long_dist_of_two_points(40.7127, 74.0059, 51.5072, 0.1275).' mi'."\n"; 
?>

Sample Output:

3458.8601748984 mi

Flowchart :

$Flowchart: Get the distance between two points on the earth$

PHP Code Editor:

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PHP: Tips of the Day

How to Sort Multi-dimensional Array by Value?

Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:

Example:

function sortByOrder($a, $b) {
    return $a['order'] - $b['order'];
}

usort($myArray, 'sortByOrder');

Starting in PHP 5.3, you can use an anonymous function:

usort($myArray, function($a, $b) {
    return $a['order'] - $b['order'];
});

And finally with PHP 7 you can use the spaceship operator:

usort($myArray, function($a, $b) {
    return $a['order'] <=> $b['order'];
});

To extend this to multi-dimensional sorting, reference the second/third sorting elements if the first is zero - best explained below. You can also use this for sorting on sub-elements.

usort($myArray, function($a, $b) {
    $retval = $a['order'] <=> $b['order'];
    if ($retval == 0) {
        $retval = $a['suborder'] <=> $b['suborder'];
        if ($retval == 0) {
            $retval = $a['details']['subsuborder'] <=> $b['details']['subsuborder'];
        }
    }
    return $retval;
});

If you need to retain key associations, use uasort() - see comparison of array sorting functions in the manual

Ref : https://bit.ly/3i77vCC