krsort
Just a short note on "don dot hosek at gmail dot com" remark, the ksort returns TRUE or FALSE and performs its actual operation directly on the array in the function call.
Thus; it would be
<?php
ksort ( $a );
?>
instead of
<?php
$a = ksort ( $a );
?>
as noted in his piece. I didn't understand why my sorting kept returning '1' at first, but that was it.
ksort
(PHP 4, PHP 5)
ksort — 对数组按照键名排序
说明
bool ksort
( array &$array
[, int $sort_flags
] )
对数组按照键名排序，保留键名到数据的关联。本函数主要用于关联数组。
如果成功则返回 TRUE，失败则返回 FALSE。
Example#1 ksort() 例子
<?php
$fruits = array("d"=>"lemon", "a"=>"orange", "b"=>"banana", "c"=>"apple");
ksort($fruits);
foreach ($fruits as $key => $val) {
echo "$key = $val\n";
}
?>
上例将输出：
a = orange b = banana c = apple d = lemon
可以用可选参数 sort_flags 改变排序的行为，详情见 sort()。
参见 asort()，arsort()，krsort()，uksort()，sort()，natsort() 和 rsort()。
Note: 第二个参数是 PHP 4 新加的。
add a note
User Contributed Notesksort
erikjr at gmail dot com
18-Sep-2007 08:06
18-Sep-2007 08:06
maxx at opentvnet dot hu
21-Aug-2007 09:17
21-Aug-2007 09:17
Beware! The function removes the keys with an empty value from the array. :-(
don dot hosek at gmail dot com
25-May-2007 09:37
25-May-2007 09:37
It's worth noting that ksort is also handy if you want to be able to do manipulations on an numerically-keyed array which may not have been initialized in numerical order:
$a[2]=7;
$a[0]=1;
$a[1]=6;
foreach($a as $b) {
echo "$b ";
}
$a = ksort($a);
foreach($a as $b) {
echo "$b ";
}
06-Nov-2006 09:26
Why not just use built-in PHP functions? You can do an in-place natural sort by keys with:
uksort($array, 'strnatcasecmp');
richard dot quadling at bandvulc dot co dot uk
24-Oct-2005 04:10
24-Oct-2005 04:10
Just to complete the comments made by ssb45.
If the supplied array is an empty array, the value returned is NOT an array.
All that is required is to pre-initialize the result.
function natksort(&$aToBeSorted)
{
$aResult = array();
$aKeys = array_keys($aToBeSorted);
natcasesort($aKeys);
foreach ($aKeys as $sKey)
{
$aResult[$sKey] = $aToBeSorted[$sKey];
}
$aToBeSorted = $aResult;
return True;
}
ssb45 at cornell dot edu
30-Jun-2005 07:58
30-Jun-2005 07:58
The function that justin at booleangate dot org provides works well, but be aware that it is not a drop-in replacement for ksort as is. While ksort sorts the array by reference and returns a status boolean, natksort returns the sorted array, leaving the original untouched. Thus, you must use this syntax:
$array = natksort($array);
If you want to use the more natural syntax:
$status = natksort($array);
Then use this modified version:
function natksort(&$array) {
$keys = array_keys($array);
natcasesort($keys);
foreach ($keys as $k) {
$new_array[$k] = $array[$k];
}
$array = $new_array;
return true;
}
justin at booleangate dot org
18-Jan-2005 05:04
18-Jan-2005 05:04
Here's a handy function for natural order sorting on keys.
function natksort($array) {
// Like ksort but uses natural sort instead
$keys = array_keys($array);
natsort($keys);
foreach ($keys as $k)
$new_array[$k] = $array[$k];
return $new_array;
}
yaroukh at email dot cz
06-May-2004 11:08
06-May-2004 11:08
I believe documentation should mention which of array-functions do reset the internal pointer; this one does so ...
pedromartinez at alquimiapaginas dot com
29-Nov-2003 11:58
29-Nov-2003 11:58
A list of directories can be listed sorted by date (newer first) with this script. This is usefull if the directories contain (for example) pictures and you want the newer to appear first.
$maindir = "." ;
$mydir = opendir($maindir) ;
// SORT
$directorios = array();
while (false !== ($fn = readdir($mydir)))
{
if (is_dir($fn) && $fn != "." && $fn != "..")
{
$directory = getcwd()."/$fn";
$key = date("Y\-m\-d\-His ", filectime($directory));
$directorios[$key] = $directory;
}
}
ksort($directorios);
$cronosdir = array();
$cronosdir = array_reverse($directorios);
while (list($key, $directory) = each($cronosdir)) {
echo "$key = $directory<bR>";
}
Pedro
09-Mar-2002 11:09
here 2 functions to ksort/uksort an array and all its member arrays
function tksort(&$array)
{
ksort($array);
foreach(array_keys($array) as $k)
{
if(gettype($array[$k])=="array")
{
tksort($array[$k]);
}
}
}
function utksort(&$array, $function)
{
uksort($array, $function);
foreach(array_keys($array) as $k)
{
if(gettype($array[$k])=="array")
{
utksort($array[$k], $function);
}
}
}
delvach at mail dot com
07-Nov-2001 05:29
07-Nov-2001 05:29
A real quick way to do a case-insensitive sort of an array keyed by strings:
uksort($myArray, "strnatcasecmp");
sbarnum at mac dot com
20-Oct-2001 06:54
20-Oct-2001 06:54
ksort on an array with negative integers as keys yields some odd results. Not sure if this is a bad idea (negative key values) or what.