PHP 5.4 introduces the useful SORT_FLAG_CASE for making any other search case insensitive. Unfortunately this isn't available in PHP 5.3 or less and so I was wondering how the following array:
array('a'=>2,'b'=>4,'A'=>1,'B'=>3);
Could be sorted into:
array('A'=>1,'a'=>2,'B'=>3,'b'=>4);
As the usual ksort() function sorts it as:
array('A'=>1,'B'=>3,'a'=>2,'b'=>4);
A comment on one of the PHP function reference pages pointed me to the uksort() function; this (and the uasort() function for sorting by value instead of key) allow the comparison algorithm for shifting in the quick sort to be written by the user.
Combine this with the very simple strcasecmp() function (which compares two strings and returns <0 for a>b and >0 for a>b) gives you:
uksort($array, 'strcasecmp');
To easily achieve the effect of:
ksort($array,SORT_STRING | SORT_FLAG_CASE);
In PHP 5.3 or less.
array_reverse($arr). Pass in true as the 2nd parameter if you want to preserve numeric keys (non-numeric keys are always preserved, and as that's what this question deals with it's probably not necessary).
krsort($array, SORT_NATURAL | SORT_FLAG_CASE); can be rewritten in this way: uksort($array, function ($a, $b) { return strcasecmp($b, $a); }); (PHP 5.3 support).This is how I have sorted (case insensitive) array of utf8 strings in PHP 7:
uksort($myarray, function ($a, $b) {
$a = mb_strtolower($a);
$b = mb_strtolower($b);
return strcmp($a, $b);
});
For PHP 5.3 you need to create your own sort function:
function mySort1($a, $b) {
$a = mb_strtolower($a);
$b = mb_strtolower($b);
return strcmp($a, $b);
}
uksort($result['rows'], 'mySort1');
I suggest, to use SORT_NATURAL flag to prevent unnatural sorting when array keys contain number or are numbers:
ksort($elements, SORT_NATURAL | SORT_FLAG_CASE);
Standard sorting:
Array
(
img1.png => some_data_1
img10.png => some_data_10
img12.png => some_data_12
img2.png => some_data_2
)
Natural order sorting:
Array
(
img1.png => some_data_1
img2.png => some_data_2
img10.png => some_data_10
img12.png => some_data_12
)
