PHP 5.6.14 is available


(PHP 4, PHP 5)

rsortOrdina un array in ordine decrescente


bool rsort ( array $array [, int $sort_flags ] )

Questa funzione ordina un array in ordine decrescente.

Restituisce TRUE in caso di successo, FALSE in caso di fallimento.

Example #1 esempio di rsort()

= array("limone""arancia""banana""mela");
while (list(
$chiave$valore) = each($frutti)) {
"$chiave = $valore\n";

Questo esempio mostrerĂ :

0 = mela
1 = limone
2 = banana
3 = arancia

I frutti sono stati ordinati in ordine alfabetico decrescente.

Si può modificare il comportamento dell'ordinamento usando il parametro opzionale sort_flags, per maggiori dettagli vedere sort().

Vedere anche arsort(), asort(), ksort(), sort() e usort().

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User Contributed Notes 6 notes

ray at non-aol dot com
10 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.
pshirkey at boosthardware dot com
10 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:

Alex M
10 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
slevy1 at pipeline dot com
14 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
1 year 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]
rnk-php at kleckner dot net
12 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.
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