reset
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] $file[1]<br>\n"; #file[0]=Unix timestamp; file[1]=filename
}
?>
rsort
(PHP 4, PHP 5)
rsort — Ordena um array em ordem descrescente
Descrição
bool rsort
( array &$array
[, int $sort_flags
] )
Essa função ordena um array em ordem descrescente (do maior para o menor).
Parâmetros
- array
-
O array de entrada.
- sort_flags
-
Você pode modificar o comportamento da ordenação usando este parâmetro opcional sort_flags , para detalhes veja a sort().
Valor Retornado
Retorna TRUE em caso de sucesso ou FALSE em falhas.
Exemplos
Exemplo #1 Exemplo de rsort()
<?php
$frutas = array ("limao", "laranja", "banana", "maçã");
rsort ($frutas);
foreach( $frutas as $chave => $valor ){
echo "$chave = $valor\n";
}
?>
O exemplo acima irá imprimir:
0 = maçã 1 = limao 2 = laranja 3 = banana
As frutas foram ordenadas em ordem alfabética decrescente.
Notas
Nota: Esta função define novas chaves para os elementos em array . Ela irá remover qualquer chave que você tenha definido, ao invés de simplesmente reordenar as chaves.
add a note
User Contributed Notesrsort
Alex M
28-Jun-2005 04:39
28-Jun-2005 04:39
pshirkey at boosthardware dot com
14-Jan-2005 10:06
14-Jan-2005 10:06
I needed a function that would sort a list of files into reversed order based on their modification date.
Here's what I came up with:
function display_content($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");
ray at non-aol dot com
02-Nov-2004 04:49
02-Nov-2004 04:49
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.
rnk-php at kleckner dot net
17-Jun-2003 09:37
17-Jun-2003 09:37
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
13-Jun-2001 08:15
13-Jun-2001 08:15
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.