reset
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.
$animals = array("dog"=>"large", "cat"=>"medium", "mouse"=>"small");
print_r($animals);
//Array ( [dog] => large [cat] => medium [mouse] => small )
rsort($animals);
print_r($animals);
//Array ( [0] => small [1] => medium [2] => large )
Use KSORT() or KRSORT() to preserve associative keys.
rsort
(PHP 4, PHP 5)
rsort — Trie un tableau en ordre inverse
Description
bool rsort
( array
&$array
[, int $sort_flags = SORT_REGULAR
] )
Effectue un tri en ordre décroissant (du plus grand au plus petit)
du tableau array.
Liste de paramètres
-
array -
Le tableau d'entrée.
-
sort_flags -
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.
Exemples
Exemple #1 Exemple avec rsort()
<?php
$fruits = array("lemon", "orange", "banana", "apple");
rsort($fruits);
foreach ($fruits as $key => $val) {
echo "$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.
Notes
Note: Cette fonction assigne de nouvelles clés pour les éléments du paramètre
array. Elle effacera toutes les clés existantes que vous aviez pu assigner, plutôt que de les trier.
Voir aussi
- arsort() - Trie un tableau en ordre inverse
- krsort() - Trie un tableau en sens inverse et suivant les clés
- Les fonctions de tri des tableaux
add a note
User Contributed Notes
rsort - [5 notes]
ray at non-aol dot com ¶
8 years ago
slevy1 at pipeline dot com ¶
11 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.
rnk-php at kleckner dot net ¶
9 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 $tmp[9] stays as is.
pshirkey at boosthardware dot com ¶
8 years ago
I needed a function that would sort a list of files into reversed order based on their modification date.
Here's what I came up with:
function display_content($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 "$val\n";
}
}
}
closedir($dh);
}
Call it like so:
display_content("folder","extension");
Alex M ¶
7 years ago
A cleaner (I think) way to sort a list of files into reversed order based on their modification date.
<?php
$path = $_SERVER[DOCUMENT_ROOT]."/files/";
$dh = @opendir($path);
while (false !== ($file=readdir($dh)))
{
if (substr($file,0,1)!=".")
$files[]=array(filemtime($path.$file),$file); #2-D array
}
closedir($dh);
if ($files)
{
rsort($files); #sorts by filemtime
#done! Show the files sorted by modification date
foreach ($files as $file)
echo "$file[0] $file[1]<br>\n"; #file[0]=Unix timestamp; file[1]=filename
}
?>