PHP 7.3.14 Released


(PHP 4, PHP 5, PHP 7)

rsortTrie un tableau en ordre inverse


rsort ( array &$array [, int $sort_flags = SORT_REGULAR ] ) : bool

Effectue un tri en ordre décroissant (du plus grand au plus petit) du tableau array.


Si deux membres se comparent comme égaux, leur ordre relatif dans le tableau trié n'est pas défini.

Liste de paramètres


Le tableau d'entrée.


Vous pouvez modifier le comportement de cette fonction en utilisant le paramètre optionnel sort_flags. Pour plus de détails, voyez le manuel pour la fonction sort().

Valeurs de retour

Cette fonction retourne TRUE en cas de succès ou FALSE si une erreur survient.


Exemple #1 Exemple avec rsort()

= array("lemon""orange""banana""apple");
foreach (
$fruits as $key => $val) {
"$key = $val\n";

L'exemple ci-dessus va afficher :

0 = orange
1 = lemon
2 = banana
3 = apple

Les fruits ont été classés dans l'ordre alphabétique inverse.


Note: Cette fonction assigne de nouvelles clés aux éléments dans array. Elle effacera toutes les clés existantes qui ont pu être assignées, plutôt que de réarranger les clés.

Voir aussi

  • arsort() - Trie un tableau en ordre inverse et conserve l'association des index
  • krsort() - Trie un tableau en sens inverse et suivant les clés
  • Les fonctions de tri des tableaux

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User Contributed Notes 6 notes

ray at non-aol dot com
15 years ago
Like sort(), rsort() assigns new keys for the elements in array. It will remove any existing keys you may have assigned, rather than just reordering the keys.  This means that it will destroy associative keys.

$animals = array("dog"=>"large",  "cat"=>"medium",  "mouse"=>"small");
//Array ( [dog] => large [cat] => medium [mouse] => small )

//Array ( [0] => small [1] => medium [2] => large )

Use KSORT() or KRSORT() to preserve associative keys.
Alex M
14 years ago
A cleaner (I think) way to sort a list of files into reversed order based on their modification date.

= $_SERVER[DOCUMENT_ROOT]."/files/";
$dh = @opendir($path);

   while (
false !== ($file=readdir($dh)))
      if (
$files[]=array(filemtime($path.$file),$file);   #2-D array

   if (
rsort($files); #sorts by filemtime

      #done! Show the files sorted by modification date
foreach ($files as $file)
"$file[0] $file[1]<br>\n"#file[0]=Unix timestamp; file[1]=filename
pshirkey at boosthardware dot com
15 years ago
I needed a function that would sort a list of files into reversed order based on their modification date.

Here's what I came up with:

function display_content($dir,$ext){

    $f = array();
    if (is_dir($dir)) {
        if ($dh = opendir($dir)) {
            while (($folder = readdir($dh)) !== false) {
                if (preg_match("/\s*$ext$/", $folder)) {
                    $fullpath = "$dir/$folder";
                    $mtime = filemtime ($fullpath);
                    $ff = array($mtime => $fullpath);
                    $f = array_merge($f, $ff);


            rsort($f, SORT_NUMERIC);

            while (list($key, $val) = each($f)) {
                $fcontents = file($val, "r");
                while (list($key, $val) = each($fcontents))
                    echo "$val\n";


Call it like so:

rnk-php at kleckner dot net
16 years ago
Apparently rsort does not put arrays with one value back to zero.  If you have an array like: $tmp = array(9 => 'asdf') and then rsort it, $tmp[0] is empty and $tmp[9] stays as is.
slevy1 at pipeline dot com
18 years ago
I thought rsort was working successfully or on a multi-dimensional array of strings that had first been sorted with usort(). But, I noticed today that the array  was only partially in descending order.  I tried array_reverse on it and that seems to have solved things.
suniafkhami at gmail dot com
5 years ago
If you are sorting an array from a database result set, such as MySQL for example, another approach could be to have your database sort the result set by using ORDER BY DESC, which would be the equivalent of using rsort() on the resulting array in PHP.

[Edited by moderator for clarity: googleguy at php dot net]
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