PHP - Sort arrays by keys and values

Question

Hello how to sort arrays by keys and values too... so if user input this value

$input = array(0,1,0,2,0);

then the result should be like this since they're the same input they should maintain their keys too...

Array
(
    [0] => 0
    [2] => 0
    [4] => 0
    [1] => 1
    [3] => 2
)

not like this... the keys is jumbled and I really that key to work on my project of FCFS Scheduling.

Array
(
    [4] => 0
    [0] => 0
    [2] => 0
    [1] => 1
    [3] => 2
)

btw I used asort. someone help me how to fix this?

this link may help you http://www.php.net/manual/en/array.sorting.php — Vandana Pareek, May 03 '14 at 11:41
possible duplicate of [Reference: all basic ways to sort arrays and data in PHP](http://stackoverflow.com/questions/17364127/reference-all-basic-ways-to-sort-arrays-and-data-in-php) — Ronni Skansing, May 03 '14 at 11:45
@JeffLouie: Can you explain how you got the first output? I can't see how your keys are ordered. — Amal Murali, May 03 '14 at 11:55
http://stackoverflow.com/questions/4353739/preserve-key-order-stable-sort-when-sorting-with-phps-uasort — alreadycoded.com, May 03 '14 at 11:56

score 0 · Answer 1 · answered May 03 '14 at 11:57

0

function cmp($a, $b)
{
    if ($a == $b) {
        return 0;
    }
    return ($a < $b) ? -1 : 1;
}

$a = array(0,1,0,2,0);

usort($a, "cmp");

foreach ($a as $key => $value) {
    echo " $value\n";
}

answered May 03 '14 at 11:57

Vandana Pareek

226
2
13

or you could use sort($input); also – Vandana Pareek May 03 '14 at 12:06

mleko · Answer 2 · 2014-05-03T12:11:59.307

Stable sort would help here. But php don't have any stable sorting functions since 4.1. But you can use uksort + closure.

$input = array(0,1,0,2,0);

$cmp = function($a, $b) use($input){
    if($input[$a] > $input[$b]){return 1;}
    elseif($input[$a] < $input[$b]){return -1;}
    elseif($a>$b){return 1;}
    elseif($a<$b){return -1;}
    return 0;
};

uksort($input, $cmp);

print_r($input);

https://eval.in/145923

Or shorter version

$cmp = function($a, $b) use($input){
    return (($input[$a]-$input[$b])?:($a-$b));
};

score -1 · Answer 3 · answered May 03 '14 at 12:01

-1

Simple use the sort function

$input = array(0,1,0,2,0);

sort($input);

Result:-
    Array
    (
        [0] => 0
        [1] => 0
        [2] => 0
        [3] => 1
        [4] => 2
    )

answered May 03 '14 at 12:01

Lalit Patel

98
1
8

PHP - Sort arrays by keys and values

3 Answers3