there is another rnatsort function lower on the page, but it didn't work in the context i needed it in.
reasoning for this:
sorting naturally via the keys of an array, but needing to reverse the order.
function rnatsort ( &$array = array() )
{
$keys = array_keys($array);
natsort($keys);
$total = count($keys) - 1;
$temp1 = array();
$temp2 = array();
// assigning original keys to an array with a backwards set of keys, to use in krsort();
foreach ( $keys as $key )
{
$temp1[$total] = $key;
--$total;
}
ksort($temp1);
// setting the new array, with the order from the krsort() and the values of original array.
foreach ( $temp1 as $key )
{
$temp2[$key] = $array[$key];
}
$array = $temp2;
}
natsort
(PHP 4, PHP 5)
natsort — "自然順"アルゴリズムで配列をソートする
説明
bool natsort ( array &$array )この関数は、人間が行うような手法でアルファベットまたは数字の文字列の順番を キー/値の関係を保持したままソートします。 これは、"自然順(natural ordering)"と呼ばれているものです。 このアルゴリズムと (sort() を用いた) 通常のコンピュータ文字列ソートアルゴリズムの違いを示す例を以下に示します。
成功した場合に TRUE を、失敗した場合に FALSE を返します。
例 312. natsort() の例
<?php
$array1 = $array2 = array("img12.png", "img10.png", "img2.png", "img1.png");
sort($array1);
echo "Standard sorting\n";
print_r($array1);
natsort($array2);
echo "\nNatural order sorting\n";
print_r($array2);
?>
上の例の出力は以下となります。
Standard sorting
Array
(
[0] => img1.png
[1] => img10.png
[2] => img12.png
[3] => img2.png
)
Natural order sorting
Array
(
[3] => img1.png
[2] => img2.png
[1] => img10.png
[0] => img12.png
)
より詳細な情報については、Martin Poolの» Natural Order String Comparison ページを参照ください。
natcasesort()、 strnatcmp() および strnatcasecmp() も参照ください。
natsort
lacent at gmail dot com
17-Jan-2007 02:42
17-Jan-2007 02:42
@gmail bereikme
02-Sep-2006 12:06
02-Sep-2006 12:06
Here's a handy function to sort an array on 1 or more columns using natural sort:
<?php
// Example: $records = columnSort($records, array('name', 'asc', 'addres', 'desc', 'city', 'asc'));
$globalMultisortVar = array();
function columnSort($recs, $cols) {
global $globalMultisortVar;
$globalMultisortVar = $cols;
usort($recs, 'multiStrnatcmp');
return($recs);
}
function multiStrnatcmp($a, $b) {
global $globalMultisortVar;
$cols = $globalMultisortVar;
$i = 0;
$result = 0;
while ($result == 0 && $i < count($cols)) {
$result = ($cols[$i + 1] == 'desc' ? strnatcmp($b[$cols[$i]], $a[$cols[$i]]) : $result = strnatcmp($a[$cols[$i]], $b[$cols[$i]]));
$i+=2;
}
return $result;
}
?>
Greetings,
- John
nissar_pa at yahoo dot com
04-May-2006 11:50
04-May-2006 11:50
Here is the program which will sort an array key in natural order and maintains key to data correlations
function natSortKey(&$arrIn)
{
$key_array = array();
$arrOut = array();
foreach ( $arrIn as $key=>$value ) {
$key_array[]=$key;
}
natsort( $key_array);
foreach ( $key_array as $key=>$value ) {
$arrOut[$value]=$arrIn[$value];
}
$arrIn=$arrOut;
}
Thanks,
Abdul Nissar
13-Mar-2006 12:44
The last comment should have been posted in doc about (r)sort( ). Indeed, and unfortunately, ORDER BY *does not* perform natural ordering. So, sometimes we *must* do a SQL request followed by natsort( ).
h3
23-Feb-2006 01:59
23-Feb-2006 01:59
This function can be very usefull, but in some cases, like if you want to sort a MySQL query result, it's important to keep in mind that MySQL as built'in sorting functions which are way faster than resorting the result using a complex php algorythm, especially with large arrays.
ex; 'SELECT * FROM `table` ORDER BY columnName ASC, columnName2 DESC'
lil at thedreamersmaze dot spam-me-not dot org
01-Feb-2006 01:38
01-Feb-2006 01:38
There's one little thing missing in this useful bit of code posted by mbirth at webwriters dot de:
<?php
function natsort2d(&$aryInput) {
$aryTemp = $aryOut = array();
foreach ($aryInput as $key=>$value) {
reset($value);
$aryTemp[$key]=current($value);
}
natsort($aryTemp);
foreach ($aryTemp as $key=>$value) {
$aryOut[$key] = $aryInput[$key];
// --------^^^^ add this if you want your keys preserved!
}
$aryInput = $aryOut;
}
?>
natcasesort.too
05-Aug-2005 07:17
05-Aug-2005 07:17
I got caught out through naive use of this feature - attempting to sort a list of image filenames from a digital camera, where the filenames are leading zero padded (e.g. DSCF0120.jpg) , will not sort correctly.
Maybe the example could be modified to exhibit this behaviour
(e.g. set array to -img0120.jpg','IMG0.png', 'img0012.png', 'img10.png', 'img2.png', 'img1.png', 'IMG3.png)
If the example hadn't used images I would have coded it correctly first time around!
mroach at mroach dot com
28-Jun-2005 01:08
28-Jun-2005 01:08
Here's an expansion of the natsort2d function that mbirth wrote. This one allows you to specify the key for sorting.
<?php
function natsort2d( &$arrIn, $index = null )
{
$arrTemp = array();
$arrOut = array();
foreach ( $arrIn as $key=>$value ) {
reset($value);
$arrTemp[$key] = is_null($index)
? current($value)
: $value[$index];
}
natsort($arrTemp);
foreach ( $arrTemp as $key=>$value ) {
$arrOut[$key] = $arrIn[$key];
}
$arrIn = $arrOut;
}
?>
phpnet at moritz-abraham dot de
03-Sep-2004 06:09
03-Sep-2004 06:09
additional to the code posted by justin at redwiredesign dot com (which I found very usefull) here is a function that sorts complex arrays like this:
<?
$array['test0'] = array('main' => 'a', 'sub' => 'a');
$array['test2'] = array('main' => 'a', 'sub' => 'b');
$array['test3'] = array('main' => 'b', 'sub' => 'c');
$array['test1'] = array('main' => 'a', 'sub' => 'c');
$array['test4'] = array('main' => 'b', 'sub' => 'a');
$array['test5'] = array('main' => 'b', 'sub' => 'b');
?>
or
<?
$array[0] = array('main' => 1, 'sub' => 1);
$array[2] = array('main' => 1, 'sub' => 2);
$array[3] = array('main' => 2, 'sub' => 3);
$array[1] = array('main' => 1, 'sub' => 3);
$array[4] = array('main' => 2, 'sub' => 1);
$array[5] = array('main' => 2, 'sub' => 2);
?>
on one or more columns.
the code
<? $array = array_natsort_list($array,'main','sub'); ?>
will result in $array being sortet like this:
test0,test2,test1,test4,test5,test3
or
0,2,1,4,5,3.
you may even submit more values to the function as it uses a variable parameter list. the function starts sorting on the last and the goes on until the first sorting column is reached.
to me it was very usefull for sorting a menu having submenus and even sub-submenus.
i hope it might help you too.
here is the function:
<?
function array_natsort_list($array) {
// for all arguments without the first starting at end of list
for ($i=func_num_args();$i>1;$i--) {
// get column to sort by
$sort_by = func_get_arg($i-1);
// clear arrays
$new_array = array();
$temporary_array = array();
// walk through original array
foreach($array as $original_key => $original_value) {
// and save only values
$temporary_array[] = $original_value[$sort_by];
}
// sort array on values
natsort($temporary_array);
// delete double values
$temporary_array = array_unique($temporary_array);
// walk through temporary array
foreach($temporary_array as $temporary_value) {
// walk through original array
foreach($array as $original_key => $original_value) {
// and search for entries having the right value
if($temporary_value == $original_value[$sort_by]) {
// save in new array
$new_array[$original_key] = $original_value;
}
}
}
// update original array
$array = $new_array;
}
return $array;
}
?>
xlab AT adaptiveNOSPAMarts DOT net
16-Jan-2004 05:51
16-Jan-2004 05:51
Under limited testing, natsort() appears to work well for IP addresses. For my needs, it is far less code than the ip2long()/long2ip() conversion I was using before.
mbirth at webwriters dot de
10-Jan-2004 05:31
10-Jan-2004 05:31
For those who want to natsort a 2d-array on the first element of each sub-array, the following few lines should do the job.
<?php
function natsort2d(&$aryInput) {
$aryTemp = $aryOut = array();
foreach ($aryInput as $key=>$value) {
reset($value);
$aryTemp[$key]=current($value);
}
natsort($aryTemp);
foreach ($aryTemp as $key=>$value) {
$aryOut[] = $aryInput[$key];
}
$aryInput = $aryOut;
}
?>
rasmus at flajm dot com
15-Dec-2003 02:30
15-Dec-2003 02:30
To make a reverse function, you can simply:
function rnatsort(&$a){
natsort($a);
$a = array_reverse($a, true);
}
justin at redwiredesign dot com
23-Aug-2003 02:10
23-Aug-2003 02:10
One of the things I've needed to do lately is apply natural sorting to a complex array, e.g.:
Array
(
[0] => Array
(
[ID] = 4
[name] = Fred
)
[1] => Array
(
[ID] = 6
[name] = Bob
)
)
where I want to sort the parent array by the child's name. I couldn't see a way of doing this using array_walk, so I've written a simple function to do it. Hopefully someone will find this useful:
/**
* @return Returns the array sorted as required
* @param $aryData Array containing data to sort
* @param $strIndex Name of column to use as an index
* @param $strSortBy Column to sort the array by
* @param $strSortType String containing either asc or desc [default to asc]
* @desc Naturally sorts an array using by the column $strSortBy
*/
function array_natsort($aryData, $strIndex, $strSortBy, $strSortType=false)
{
// if the parameters are invalid
if (!is_array($aryData) || !$strIndex || !$strSortBy)
// return the array
return $aryData;
// create our temporary arrays
$arySort = $aryResult = array();
// loop through the array
foreach ($aryData as $aryRow)
// set up the value in the array
$arySort[$aryRow[$strIndex]] = $aryRow[$strSortBy];
// apply the natural sort
natsort($arySort);
// if the sort type is descending
if ($strSortType=="desc")
// reverse the array
arsort($arySort);
// loop through the sorted and original data
foreach ($arySort as $arySortKey => $arySorted)
foreach ($aryData as $aryOriginal)
// if the key matches
if ($aryOriginal[$strIndex]==$arySortKey)
// add it to the output array
array_push($aryResult, $aryOriginal);
// return the return
return $aryResult;
}
flash at minet dot net
13-Aug-2003 02:27
13-Aug-2003 02:27
About the reverse natsort.. Maybe simpler to do :
function strrnatcmp ($a, $b) {
return strnatcmp ($b, $a);
}
dslicer at maine dot rr dot com
03-Jun-2003 10:41
03-Jun-2003 10:41
Something that should probably be documented is the fact that both natsort and natcasesort maintain the key-value associations of the array. If you natsort a numerically indexed array, a for loop will not produce the sorted order; a foreach loop, however, will produce the sorted order, but the indices won't be in numeric order. If you want natsort and natcasesort to break the key-value associations, just use array_values on the sorted array, like so:
natsort($arr);
$arr = array_values($arr);
anonymous at coward dot net
31-May-2003 05:46
31-May-2003 05:46
Reverse Natsort:
function rnatsort($a, $b) {
return -1 * strnatcmp($a, $b);
}
usort($arr, "rnatsort");