Fastest way of sorting multidimensional arrays in php

Question

Array
(
[0] => Array
(
[t] => 81881
[b] => 99494
)
[1] => Array
(
)
...
...
)

I have a multidimensional array like above.The entries in this array would be ranging upto 20k. I want to sort this array acc. to "t" index without calling any external function. Any suggestions for improving the efficiency.

m.d. for multidimensional and acc. for according are not standard shortcuts as far as I know — brian_d
– brian_d, Commented Jan 17, 2011 at 6:17

Community · Accepted Answer · 2023-11-17 20:38:18Z

3

I doubt there is something faster than array_multisort() https://www.php.net/array_multisort

UPDATE:

Finding out now, that data is not really multidimensional (it's just a key that's hidden as a val of item in array). It would be probably easier to use something like:

http://php.net/manual/en/function.usort.php

function cmp($a, $b)
{
    return $a['t']<=>$b['t'];
}

usort($arr, 'cmp');

edited Nov 17, 2023 at 20:38

CommunityBot

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answered Jan 17, 2011 at 6:19

Chris Hasiński

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1 Comment

Gumbo Over a year ago

Please give an example how to use array_multisort in this case.

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