PHP Searching and Sorting Algorithm: Bead sort

Last update on May 30 2022 11:47:47 (UTC/GMT +8 hours)

PHP Searching and Sorting Algorithm: Exercise-13 with Solution

Write a PHP program to sort a list of elements using Bead sort.

Sample Solution :

PHP Code :

<?php
function columns($my_array) {
    if (count($my_array) == 0)
        return array();
    else if (count($my_array) == 1)
        return array_chunk($my_array[0], 1);
     array_unshift($my_array, NULL);
    // array_map(NULL, $my_array[0], $my_array[1], ...)
    $transpose = call_user_func_array('array_map', $my_array);
    return array_map('array_filter', $transpose);
}
function bead_sort($my_array) {
    foreach ($my_array as $e)
        $poles []= array_fill(0, $e, 1);
    return array_map('count', columns(columns($poles)));
}
$test_array = array(3, 2, 5, 4, 1, 100);
echo "\nOriginal Array :\n";
echo implode(', ',$test_array );
echo "\nSorted Array :\n";
echo implode(', ',bead_sort($test_array)). PHP_EOL;

?>

Sample Output:

Original Array                                                      
:3, 2, 5, 4, 1, 100                                                 
Sorted Array :                                                      
100, 5, 4, 3, 2, 1

Flowchart :

PHP Code Editor:

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Previous: Write a PHP program to sort a list of elements using Radix sort.
Next: Write a PHP program to sort a list of elements using Bogo sort.

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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