Sort Multi-Dimensional Array By Value In PHP

sort-array.php

<?php 
/**
 * Sort Multi Dimensional Array by value in PHP
 * 
 * @link http://www.paulund.co.uk/sort-multi-dimensional-array-value
 */

// Original array
Array
(
    [item-1] => Array
        (
            [id] => 1
            [title] => Item 1
            [order] => 3
        )

    [item-2] => Array
        (
            [id] => 2
            [title] => Item 2
            [order] => 2
        )

    [item-3] => Array
        (
            [id] => 3
            [title] => Item 3
            [order] => 1
        )
)

// Pass array with callback function that defines how to order
usort($array, 'sort_by_order ');
function sort_by_order ($a, $b) {
    return $a['order'] - $b['order'];
}

// Sorted array
Array
(
    [item-3] => Array
        (
            [id] => 3
            [title] => Item 3
            [order] => 1
        )

    [item-2] => Array
        (
            [id] => 2
            [title] => Item 2
            [order] => 2
        )

    [item-1] => Array
        (
            [id] => 1
            [title] => Item 1
            [order] => 3
        )
)