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Last updated: Sat, 27 Jan 2007

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# rsort

(PHP 3, PHP 4, PHP 5)

rsort -- Отсортировать массив в обратном порядке

## Описание

bool rsort ( array &array [, int sort_flags] )

Эта функция сортирует массив в обратном порядке (от большего к меньшему).

Возвращает `TRUE` в случае успешного завершения или `FALSE` в случае возникновения ошибки.

Пример 1. Пример использования rsort()

`<?php
$fruits = array("lemon", "orange", "banana", "apple");
rsort($fruits);
reset($fruits);
while (list($key, $val) = each($fruits)) {
echo "$key = $val
";
}
?>`

Результат выполнения данного примера:

    0 = orange
    1 = lemon
    2 = banana
    3 = apple

Названия фруктов были отсортированы по алфавиту в обратном порядке.

Вы можете изменить поведение сортировки, используя дополнительный параметр `sort_flags`, подробнее см. sort().

См. также arsort(), asort(), ksort(), sort() и usort().

add a note User Contributed Notes
rsort
Alex M
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] $file[1]<br>\n"; #file[0]=Unix timestamp; file[1]=filename
}
?>`
pshirkey at boosthardware dot com
14-Jan-2005 01:06
`I needed a function that would sort a list of files into reversed order based on their modification date.
Here's what I came up with:
function display_content($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
`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
`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
`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.`
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Last updated: Sat, 27 Jan 2007
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