PHP sort multidimensional 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

function aasort (&$array, $key) {
    $sorter=array();
    $ret=array();
    reset($array);
    foreach ($array as $ii => $va) {
        $sorter[$ii]=$va[$key];
    }
    asort($sorter);
    foreach ($sorter as $ii => $va) {
        $ret[$ii]=$array[$ii];
    }
    $array=$ret;
}

aasort($your_array,"order");

Answer 2

I use this function :

function array_sort_by_column(&$arr, $col, $dir = SORT_ASC) {
    $sort_col = array();
    foreach ($arr as $key=> $row) {
        $sort_col[$key] = $row[$col];
    }

    array_multisort($sort_col, $dir, $arr);
}


array_sort_by_column($array, 'order');

Answer 3

I usually use usort, and pass my own comparison function. In this case, it is very simple:

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

usort($array, 'compareOrder');

Answer 4

Try a usort: If you don't have access to anonymous functions yet (Before PHP 5.3), you'll have to define a sorting function first:

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

usort($myArray, 'sortByOrder');

Answer 5

Can anyone help me with this one? I'm trying to sort this multidimensional array by "age" where the keys are strings and not an index number?

Array
(
    [george1] => Array
        (
            [name] => Georgia
            [age] => 32
        )

    [george2] => Array
        (
            [name] => George
            [age] => 16
        )

    [george3] => Array
        (
            [name] => Georgette
            [age] => 54
        )

    [george4] => Array
        (
            [name] => Georgina
            [age] => 27
        )

)

I just can't seem to get the sort right.... The array