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PHP Array Exercises : Sort an array in reverse order

PHP Array: Exercise-28 with Solution

Write a PHP script to sort an array in reverse order (highest to lowest).

Sample Solution:

PHP Code:

<?php
$colors = array("Red", "Orange", "Black", "White");
rsort($colors);
print_r($colors);
?>

Sample Output: 

Array                                                       
(                                                           
    [0] => White                                            
    [1] => Red                                              
    [2] => Orange                                           
    [3] => Black                                            
)

Flowchart:

Flowchart: PHP - Sort an array in reverse order

PHP Code Editor:

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Previous: Write a PHP function to generate a random password (contains uppercase, lowercase, numeric and other) using shuffle() function.
Next: Write a PHP program to generate an array with a range taken from a string.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.



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