Sort an array by key value

Question

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How to sort a multidimensional array by a certain key?

I would like to sort an array, which looks like below, by the key value:

 $arr = ([0]=>Int(5)
         [1]=> Array ( [0]=>Int(4) , [1]=>String(10) , [2]=>String(22) , ['prop']=>Int(2))
         [2]=> Array ( [0]=>Int(4) , [1]=>String(10) , [2]=>String(22) , ['prop']=>Int(2))
         [3]=> Array ( [0]=>Int(4) , [1]=>String(10) , [2]=>String(22) , ['prop']=>Int(2))
        )

So, as a result i would like to have the $arr sorted by the ['prop']'s value.

I've tried bubble sort but without any result.

Take a look at [usort()](http://php.net/manual/en/function.usort.php) — Jeroen, Jun 25 '12 at 12:18
@Jeroen i've tried usort() and it goes on timeout on execution! — Emil Dumbazu, Jun 25 '12 at 12:30

score 0 · Answer 1 · answered Jun 25 '12 at 12:21

0

usort($array, function($a, $b) {
    if($a['prop'] == $b['prop']) return 0;
    return ($a['prop'] < $b['prop']) ? -1 : 1;
});

Note: this only works if you have PHP >5.3 (because it uses an anonymous function)

answered Jun 25 '12 at 12:21

Jeroen

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i've tried usort() and it goes on timeout on execution! – Emil Dumbazu Jun 25 '12 at 12:30

Sort an array by key value

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