reset
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.
rsort
(PHP 4, PHP 5)
rsort — مرتبسازی آرایه به ترتیب خلاف
Description
bool rsort
( array &$array
[, int $sort_flags = SORT_REGULAR
] )
این تابع آرایه را با ترتیب خلاف مرتب میکند (از بیشترین به کمترین).
Parameters
- array
-
آرایه ورودی.
- sort_flags
-
شما رفتار مرتبسازی را میتوانید با استفاده از پارامتر اختیاری sort_flags تغییر دهید، برای جزئیات بیشتر sort() را ببینید.
Return Values
Returns TRUE on success or FALSE on failure.
Examples
Example #1 مثال rsort()
<?php
$fruits = array("lemon", "orange", "banana", "apple");
rsort($fruits);
foreach ($fruits as $key => $val) {
echo "$key = $val\n";
}
?>
The above example will output:
0 = orange 1 = lemon 2 = banana 3 = apple
میوهها براساس ترتیب خلاف حروف الفبا مرتب شده است.
Notes
Note: This function assigns new keys to the elements in array. It will remove any existing keys that may have been assigned, rather than just reordering the keys.
See Also
- arsort() - Sort an array in reverse order and maintain index association
- krsort() - Sort an array by key in reverse order
- The comparison of array sorting functions
add a note
User Contributed Notes
rsort - [5 notes]
ray at non-aol dot com ¶
8 years ago
slevy1 at pipeline dot com ¶
11 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.
rnk-php at kleckner dot net ¶
9 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 $tmp[9] stays as is.
pshirkey at boosthardware dot com ¶
8 years ago
I needed a function that would sort a list of files into reversed order based on their modification date.
Here's what I came up with:
function display_content($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");
Alex M ¶
7 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
}
?>