How to Sort a Multi-dimensional Array by Value

Question

How can I sort this array by the value of the "order" key?

Even though the values are currently sequential, they will not always be.

Array
(
    [0] => Array
        (
            [hashtag] => a7e87329b5eab8578f4f1098a152d6f4
            [title] => Flower
            [order] => 3
        )

    [1] => Array
        (
            [hashtag] => b24ce0cd392a5b0b8dedc66c25213594
            [title] => Free
            [order] => 2
        )

    [2] => Array
        (
            [hashtag] => e7d31fc0602fb2ede144d18cdffd816b
            [title] => Ready
            [order] => 1
        )
)

Answer 1

Make a usort. You must define a sorting function first if you are still using PHP version 5.2 or earlier:

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

usort($myArray, 'sortByOrder');

You can use an anonymous function as of PHP 5.3:

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

You can employ the spaceship operator with PHP 7:

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

I hope this helps you.