PHP Sort multidimensional array by two criterias

Question

I have this array and I need to sort it, first by "key_1" and (in case of more of one similar values in "key_1") sort it by "key_2" ... how can I do this, any idea?

Thanks!

$my_array[0]['key_1'] = 2;
$my_array[0]['key_2'] = 300;

$my_array[1]['key_1'] = 2;
$my_array[1]['key_2'] = 100;

$my_array[2]['key_1'] = 1;
$my_array[2]['key_2'] = 100;

Skrol29 · Accepted Answer · 2012-04-06 21:04:17Z

1

Here is a simple solution :

function my_sort($a, $b) {
  if ($a['key_1']==$b['key_1']) {
    if ($a['key_2']==$b['key_2']) {
      return 0;
    } else {
      return ($a['key_2']>$b['key_2']) ? 1 : -1;
    }
  } else {
    return ($a['key_1']>$b['key_1']) ? 1 : -1;
  }
}

usort($my_array, 'my_sort');

answered Apr 6, 2012 at 21:04

Skrol29

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