Sort a multidimensional array by two variables

Question

I have an array that looks something like below, but it could potentially contain more drafts.

$multi_arr = array(
    'draft1' => array (
        'alloc_coeff' => 560,
        'steps_count' => 2,
        'order_draft' => array(
            '0' => array(
                'whse_id' => 4,
                'quantity' => 0,
                'percent' => 0
            ),
            '1' => array(
                'whse_id' => 1,
                'quantity' => 10,
                'percent' => 66.666666666667
            )           
        )
    ),
    'draft2' => array (
        'alloc_coeff' => 1517,
        'steps_count' => 1,
        'order_draft' => array(
            '0' => array(
                'whse_id' => 1,
                'quantity' => 10,
                'percent' => 66.666666666667
            )      
        )
    ),
    'draft3' => array (
        'alloc_coeff' => 559,
        'steps_count' => 2,
        'order_draft' => array(
            '0' => array(
                'whse_id' => 2,
                'quantity' => 0,
                'percent' => 0
            ),
            '1' => array(
                'whse_id' => 1,
                'quantity' => 10,
                'percent' => 66.666666666667
            )           
        )
    )
);

I need to sort the content by using two variables: alloc_coeff and steps_count.

First alloc_coeff needs to be considered from the highest to the lowest value.

And then as a second variable the steps_count from lowest value to highest.

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

I don't need the entire array to be rewritten and stored in a temporary variable, I just need the keys sorted like this (expected outcome) draft2, draft1 and lastly draft3.

What's a way to accomplish this?

Death-is-the-real-truth · Accepted Answer · 2017-12-25 07:46:47Z

1

You can do it like below:-

array_multisort(array_column($multi_arr, 'alloc_coeff'), SORT_DESC,
                array_column($multi_arr, 'steps_count'), SORT_ASC,
                $multi_arr);

Output:- https://eval.in/924894 And https://eval.in/924892

Note:- tested in 5.6.23 and PHP 7.0.8

answered Dec 25, 2017 at 7:46

Death-is-the-real-truth

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2 Comments

Nikk Over a year ago

Wow! That is so simple! Thanks.

Death-is-the-real-truth Over a year ago

@Borsn glad to help you :):)

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