How can I sort this array by array keys?
array(
4 => 'four',
3 => 'three',
2 => 'two',
1 => 'one',
)
Desired result:
array(
1 => 'one',
2 => 'two',
3 => 'three',
4 => 'four',
)
-
Dictionaries are not sorted ... extract the keys into a separate list and sort that.Hamish Grubijan– Hamish Grubijan2010-01-11 22:31:40 +00:00Commented Jan 11, 2010 at 22:31
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4 Answers
If you want to sort the keys in DESC order use:
krsort($arr);
If you want to sort the values in DESC order and maintain index association use:
arsort($arr);
If you want to sort the values in DESC natural order and maintain index association use:
natcasesort($arr);
$arr = array_reverse($arr, true);
Comments
If you just want to reverse the order, use array_reverse:
$reverse = array_reverse($array, true);
The second parameter is for preserving the keys.
Comments
You have an array, you want to sort it by keys, in reverse order -- you can use the krsort function :
Sorts an array by key in reverse order, maintaining key to data correlations. This is useful mainly for associative arrays.
In you case, you'd have this kind of code :
$arr = array(
1 => 'one',
2 => 'two',
3 => 'three',
4 => 'four',
);
krsort($arr);
var_dump($arr);
which would get you this kind of output :
$ /usr/local/php-5.3/bin/php temp.php
array(4) {
[4]=>
string(4) "four"
[3]=>
string(5) "three"
[2]=>
string(3) "two"
[1]=>
string(3) "one"
}
As a sidenode : if you had wanted to sort by values, you could have used arsort -- but it doesn't seem to be what you want, here.
Comments
Try krsort() - that will sort in reverse using the array key, whereas rsort will sort on the array value.
