keep array keys while sorting 2D array

Question

It's my 2D array:

$a = array(
    '6' => array(10, 5),
    '5' => array(20, 7),
    '40' => array(15, 9)
);

I can sort it simply with array_multisort:

foreach ($a as $k => $r) {
    $keys[$k] = $r[1]; 
}
array_multisort($keys, SORT_DESC, $a);

but it clears the keys ('6', '5', '40'):

Array
(
    [0] => Array
        (
            [0] => 15
            [1] => 9
        )

    [1] => Array
        (
            [0] => 20
            [1] => 7
        )

    [2] => Array
        (
            [0] => 10
            [1] => 5
        )

)

Does array_multisort have any parameters to keep array keys?

@W.Kristianto: No, I want to sort the array. But I want to keep the keys also, and don't like to replace them by array numeric keys (start from 0) — mrdaliri
– mrdaliri, Commented Sep 12, 2012 at 10:25

deceze · Accepted Answer · 2012-09-12 10:06:26Z

7

Simpler solution using uasort:

uasort($a, function ($a, $b) { return $a[1] - $b[1]; });

answered Sep 12, 2012 at 10:06

deceze♦

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2 Comments

mrdaliri Over a year ago

Thanks. but how can I change the sorting direction?

deceze Over a year ago

Switch the $a and $b arguments around.

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