在没有密钥的PHP中排序多维数组？ [重复]

Question

This question already has an answer here:

• How can I sort arrays and data in PHP? 10 answers

I want to sort a multidimensional array in numerical order bu second value of each item.

This is array:

$vulc = array(
        array('s',3),
        array('s',5),
        array('s',2)
    );

and i want this output:

$vulc = array(
        array('s',5),
        array('s',3),           
        array('s',2)
    );

I'm tried this:

foreach ($vulc as $key => $row) {
    $distance[$key] = $row[2];
}

array_multisort($distance, SORT_ASC, $vulc);

but doesn't work :( please help me and not suggest to see other answer... usually other answer are too difficult :(

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Answer 1

Use the usort function and Try:

function sortByOrder($a, $b) {
    return $b[1] - $a[1]; // $b[1] - $a[1] because it need to be descending order
}

usort($vulc, 'sortByOrder');

Output:

Array
(
    [0] => Array
        (
            [0] => s
            [1] => 5
        )

    [1] => Array
        (
            [0] => s
            [1] => 3
        )

    [2] => Array
        (
            [0] => s
            [1] => 2
        )

)