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] $file[1]<br>\n"; #file[0]=Unix timestamp; file[1]=filename
}
?>
rsort
(PHP 4, PHP 5)
rsort — Sortiert ein Array in umgekehrter Reihenfolge
Beschreibung
bool rsort
( array &$array
[, int $sort_flags
] )
Diese Funktion sortiert ein Array in umgekehrter Reihenfolge (vom höchsten zum niedrigsten Wert).
Hinweis: Diese Funktion weist den Elementen des Arrays array neue Schlüssel zu. Bestehende Schlüssel die Sie eventuell zugewiesen haben werden entfernt statt einfach nur die Schlüssel neu anzuordnen
Gibt bei Erfolg TRUE zurück, im Fehlerfall FALSE.
Beispiel #1 rsort()
<?php
$fruits = array("Zitrone", "Orange", "Banane", "Apfel");
rsort($fruits);
foreach ($fruits as $key => $val) {
echo "$key = $val\n";
}
?>
Das oben gezeigte Beispiel erzeugt folgende Ausgabe:
0 = Zitrone 1 = Orange 2 = Banane 3 = Apfel
Die Früchte wurden in umgekehrter alphabetischer Reihenfolge sortiert.
Sie können das Verhalten der Sortierung mittels dem optionalen Parameter sort_flags beeinflussen, für Details siehe sort().
Siehe auch arsort(), asort(), ksort(), krsort(), sort() und usort().
add a note
User Contributed Notesrsort
Alex M
27-Jun-2005 07:39
27-Jun-2005 07:39
pshirkey at boosthardware dot com
14-Jan-2005 01:06
14-Jan-2005 01:06
I needed a function that would sort a list of files into reversed order based on their modification date.
Here's what I came up with:
function display_content($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 07:49
02-Nov-2004 07:49
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 12:37
17-Jun-2003 12:37
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
12-Jun-2001 11:15
12-Jun-2001 11:15
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.