I've been breaking my head over the following problem.
I've got this array:
[596] => 2
[9] => 2
[358] => 2
[1579] => 1
[156] => 1
[576] => 1
[535] => 1
As you can see, the values are ordered in a descending way, but the keys are random. I would like to keys to be sorted DESC as well though. I've been playing with array_multisort, but I haven't been able to fix the problem with it. The first problem that I encountered was the fact that array_multisort reindexes numeric keys. I changed to keys to a non-numeric variant, namely k596 etc... That made me able to sort the keys, but not like I wanted it to.
[k9] => 2
[k596] => 2
[k358] => 2
[k576] => 1
[k535] => 1
[k1579] => 1
[k156] => 1
The result that I would like to see in the end is:
[k596] => 2
[k358] => 2
[k9] => 2
[k1579] => 1
[k576] => 1
[k535] => 1
[k156] => 1
Is anyone able to help me out here? There must be a simple way to do this, right?
Ok this question is a bit more tricky then I thought! Given an array $arry = array('a'=>'hilbert', 'b'=>'noether', 'c'=>'landau');
I would generate a second array containing tuples like this:
$brry = array();
foreach($arry as $key => $value){
$brry[] = array($key,$value);
}
//Now $brry looks like:
//$brry:
// [0] => array('a','hilbert');
// [1] => array('b','noether');
// [2] => array('c','landau');
//now you can easily sort it!
usort($brry, "cmp");
//And then transform it back to the array structure you have before
foreach($brry as $value){
$crry[$value[0]] = $value[1];
}
//with this sorting function cmp:
function cmp($first, $second){
if(strcmp($first[1], $second[1]) != 0){
return strcmp($first[1], $second[1]);
}
else{
return strcmp($first[0], $second[0]);
}
}
The function cmp
sorts by strings now so strcmp("192","20") > 0
while this might not be true for integers!
uksort($array, function ($a, $b) use ($array) {
if ($array[$a] != $array[$b]) {
return $array[$a] - $array[$b];
}
return $a - $b;
});
Insert appropriate comparison operations, using simply -
here as an example. This is somewhat trickier if you're dependent on PHP < 5.3 and don't have anonymous functions.
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