reset
I just wrote a little function for sort an array in reverse order WITHOUT pre-ordering the numbers in it..
I hope, someone can use it. ;)
<?php
function rsort_rec($array)
{
if ( !is_array($array) ) return $array; # return original input when it's not an array
$c = count($array);
$c--;
$j = -1;
for ( $i = $c; $i > -1; $i-- )
{
$array_rec[] = $array[$i];
}
return $array_rec;
}
$input = array(167, 20, 100, 205);
print_r(rsort($input)); # printout reordered array with rsort()
# Output: Array ( [0] => 205 [1] => 167 [2] => 100 [3] => 20 )
print_r(rsort_rec($input)); # printout reordered array with rsort_rec()
# Output: Array ( [0] => 205 [1] => 100 [2] => 20 [3] => 167 )
?>
rsort
(PHP 4, PHP 5)
rsort — Ordena una matriz en orden inverso
Descripción
void rsort
( array &$matriz
[, int $sort_flags
] )
Esta función ordena una matriz en orden inverso (mayor a menor).
Devuelve TRUE si todo se llevó a cabo correctamente, FALSE en caso de fallo.
Example #1 Ejemplo de rsort()
<?php
$fruits = array("lemon", "orange", "banana", "apple");
rsort($fruits);
reset($fruits);
while (list($key, $val) = each($fruits)) {
echo "$key = $val\n";
}
?>
El resultado del ejemplo seria:
0 = orange 1 = lemon 2 = banana 3 = apple
Las frutas han sido ordenadas en orden alfabético inverso.
Puede modificar el comportamiento del orden usando el parámetro opcional sort_flags , para más detalles vea sort().
add a note
User Contributed Notesrsort
manallesweg at gmx dot de
15-Jan-2008 02:03
15-Jan-2008 02:03
Alex M
27-Jun-2005 07:39
27-Jun-2005 07:39
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] $file[1]<br>\n"; #file[0]=Unix timestamp; file[1]=filename
}
?>
pshirkey at boosthardware dot com
14-Jan-2005 01:06
14-Jan-2005 01:06
I needed a function that would sort a list of files into reversed order based on their modification date.
Here's what I came up with:
function display_content($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.