up vote 4 down vote favorite

How can I sort a array like this by its keys, from the smaller resolution to the larger one:

$sizes = array(
   '120x120' => 'large',
   '60x60' => 'small',
   '200x200' => 'very large',
   '90x90' => 'medium',
...

?

should be :

  • 60x60
  • 90x90
  • 120x120
  • 200x200
  • ...
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5 Answers

up vote 7 down vote accepted

ksort() in numeric mode should work just fine :

$sizes = array(
   '120x120' => 'large',
   '60x60' => 'small',
   '200x200' => 'very large',
   '90x90' => 'medium',
);

ksort($sizes, SORT_NUMERIC);
var_dump($sizes);

will get you :

array
  '60x60' => string 'small' (length=5)
  '90x90' => string 'medium' (length=6)
  '120x120' => string 'large' (length=5)
  '200x200' => string 'very large' (length=10)


This will work because the size is a numeric -- and is found before the 'x' (not sure what will be done with the 'x' and what follows -- but, anyway, that part of the keys is useless, as it's purely redondant information)

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+1 that's the way... – Positive Apr 4 '11 at 7:04
thank you, I didn't think sorting by numbers would work because I have a x there :) – Alex Apr 4 '11 at 7:06
@Alexandra PHP will effectively truncate the "number" when it hits the 'x'. As such, you're only really sorting on the first number. – middaparka Apr 4 '11 at 7:08
up vote 2 down vote

Try with ksort().

Sorts an array by key, maintaining key to data correlations. This is useful mainly for associative arrays.

Edit: to make the answer complete, please do use the SORT_NUMERIC flag.

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An explanation would go well with that downvote! – code_burgar Apr 4 '11 at 7:02
1  
-1 That does not work try to understand question output [120x120] => large [200x200] => very large [60x60] => small [90x90] => medium – Positive Apr 4 '11 at 7:03
1  
these are strings and will not get sorted like integers – Positive Apr 4 '11 at 7:04
+1 from me, maybe there vegetarian?... – Lawrence Cherone Apr 4 '11 at 7:06
up vote 0 down vote

If you take a look at PHP's Sorting Arrays manual page, you can see there are a few options for sorting the array based on its keys, of which ksort (using the SORT_NUMERIC modifier) is most likely the one you're after.

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but it doesn't really work. I get 120x120, 200x200, 60x60, 90x90 ... – Alex Apr 4 '11 at 7:03
@Alexandra Apologies - you need to use the SORT_NUMERIC modifier to ksort. @Pascal's superior answer illustrates this perfectly. :-) – middaparka Apr 4 '11 at 7:04
up vote 4 down vote

you need natural sort by keys, can use uksort 

uksort($array, 'strnatcasecmp');
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up vote 1 down vote 
$sizes = array(
   '120x120' => 'large',
   '60x60' => 'small',
   '200x200' => 'very large',
   '90x90' => 'medium');
uksort($sizes, 'userSorting');
print_r($sizes);
function userSorting($a, $b) {
    $a = explode('x', $a);
    $b = explode('x', $b);
    return $a[0] > $b[0];
}
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