Fastest way of sorting this multidimensional array?

Question

What is the fastest way of sorting this both alphabetically by country and numerically by date?:

Array
(
[JAPAN] => Array
    (
        [2010-10-17] => 2
    )

[CUBA] => Array
    (
        [2010-10-16] => 9
    )

[RUSSIAN FEDERATION] => Array
    (
        [2010-10-16] => 26
        [2010-10-17] => 6
        [2010-10-18] => 2
    )

[CHINA] => Array
    (
        [2010-10-16] => 13
    )

)

Why do you need the fastest way?

salathe
– salathe

2010-10-19 11:56:53 +00:00
Commented Oct 19, 2010 at 11:56 — salathe
– salathe, Commented Oct 19, 2010 at 11:56

Steve Robbins · Accepted Answer · 2011-07-01 02:12:46Z

1

foreach ($array as $value) {

    ksort($value);
}

ksort($array);

http://codepad.org/wJn0hJN4

array(4) {
  ["CHINA"]=>
  array(1) {
    ["2010-10-16"]=>
    int(13)
  }
  ["CUBA"]=>
  array(1) {
    ["2010-10-16"]=>
    int(9)
  }
  ["JAPAN"]=>
  array(1) {
    ["2010-10-17"]=>
    int(2)
  }
  ["RUSSIAN FEDERATION"]=>
  array(3) {
    ["2010-10-16"]=>
    int(26)
    ["2010-10-17"]=>
    int(6)
    ["2010-10-18"]=>
    int(2)
  }
}

edited Jul 1, 2011 at 2:12

answered Jun 30, 2011 at 21:58

Steve Robbins

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1 Comment

Artefact2 Over a year ago

I'd rather use the shorter code : foreach($array as &$value) { ksort($value); } ksort($array);.

kovshenin · Accepted Answer · 2010-10-19 11:47:18Z

0

You will have to benchmark on more data. I'd try ksort for sorting by countries and usort for sorting by dates.

answered Oct 19, 2010 at 11:47

kovshenin

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