PHP 5.4.36 Released

rsort

(PHP 4, PHP 5)

rsortSortuj tablicę w porządku odwrotnym

Opis

void rsort ( array &$tablica [, int $flagi ] )

Ta funkcja sortuje tablicę w porządku odwrotnym (od największego do najmniejszego).

Informacja: Ta funkcja przypisuje nowe klucze dla elementów argumentu tablica. Wszystkie istniejące klucze zostaną usunięte.

Zwraca TRUE w przypadku powodzenia, FALSE w przypadku błędu.

Przykład #1 Przykład użycia rsort()

<?php
$owoce 
= array("cytryna""pomarańcza""banan""jabłko");
rsort($owoce);
foreach (
$owoce as $key => $val) {
    echo 
"$key = $val\n";
}
?>

Powyższy przykład wyświetli:

0 = pomarańcza
1 = jabłko
2 = cytryna
3 = banan

Owoce zostały posortowane w odwrotnym porządku alfabetycznym.

Możesz zmodyfikować zachowanie sortowania przez użycie opcjonalnego parametru flagi. Aby uzyskać szczegóły zobacz sort().

Patrz także: arsort(), asort(), ksort(), krsort(), sort() i usort().

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User Contributed Notes 6 notes

up
5
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.

$animals = array("dog"=>"large",  "cat"=>"medium",  "mouse"=>"small");
print_r($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.
up
2
Alex M
9 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
  
}
?>
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2
slevy1 at pipeline dot com
13 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.
up
1
pshirkey at boosthardware dot com
9 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");
up
-1
suniafkhami at gmail dot com
9 months 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]
up
-4
rnk-php at kleckner dot net
11 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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