The first thing that I didn't find in description it's that this function return results from MIN value to MAX value, ex: [-5=>'', 0=>'', 5=>'' ]
Also you should know that by default, it has correct sorting for keys that represented as string but has a number as value, ex: ['-5'=>'', '0'=>'', '5'=>'' ]
Few examples with results:
-----------------------------------------
DESCRIPTION: Keys are numbers + default flag (SORT_REGULAR)
$arr = [
-5 => 'minus five',
0 => 'zero',
1 => 'one',
2 => 'two',
100 => 'hundred',
];
ksort($arr);
print_r($arr);
RESULT:
Array
(
[-5] => minus five
[0] => zero
[1] => one
[2] => two
[100] => hundred
)
-----------------------------------------
DESCRIPTION: Keys are string numbers + default flag (SORT_REGULAR)
$arr = [
'-5' => 'minus five',
'0' => 'zero',
'1' => 'one',
'2' => 'two',
'100' => 'hundred',
];
ksort($arr);
print_r($arr);
RESULT:
Array
(
[-5] => minus five
[0] => zero
[1] => one
[2] => two
[100] => hundred
)
-----------------------------------------
DESCRIPTION: Keys are string numbers + SORT_STRING flag
$arr = [
'-5' => 'minus five',
'0' => 'zero',
'1' => 'one',
'2' => 'two',
'100' => 'hundred',
];
ksort($arr, SORT_STRING);
print_r($arr);
RESULT:
Array
(
[-5] => minus five
[0] => zero
[1] => one
[100] => hundred
[2] => two
)
-----------------------------------------
DESCRIPTION: Keys are string numbers + SORT_NUMERIC flag
$arr = [
'-5' => 'minus five',
'0' => 'zero',
'1' => 'one',
'2' => 'two',
'100' => 'hundred',
];
ksort($arr, SORT_NUMERIC);
print_r($arr);
RESULT:
Array
(
[-5] => minus five
[0] => zero
[1] => one
[2] => two
[100] => hundred
)
ksort
(PHP 4, PHP 5, PHP 7)
ksort — 키에 의한 배열 정렬
설명
bool ksort
( array
&$array
[, int $sort_flags
] )키에 의해 배열을 정렬하고, 키와 데이터의 연관성을 유지한다. 이 함수는 주로 연관 배열에 유용하다.
반환값
성공 시 TRUE를, 실패 시 FALSE를 반환합니다.
변경점
| 버전 | 설명 |
|---|---|
| 4.0.0 |
선택적인 sort_flags 인수 추가.
|
예제
Example #1 ksort() 예제
<?php
$fruits = array ("d"=>"lemon", "a"=>"orange", "b"=>"banana", "c"=>"apple");
ksort($fruits);
foreach ($fruits as $key => $val) {
echo "$key = $val\n";
}
?>
위 예제의 출력:
a = orange b = banana c = apple d = lemon
add a note
User Contributed Notes 16 notes
orlov0562 at gmail dot com ¶
7 years ago
DavidG ¶
14 years ago
A nice way to do sorting of a key on a multi-dimensional array without having to know what keys you have in the array first:
<?php
$people = array(
array("name"=>"Bob","age"=>8,"colour"=>"red"),
array("name"=>"Greg","age"=>12,"colour"=>"blue"),
array("name"=>"Andy","age"=>5,"colour"=>"purple"));
var_dump($people);
$sortArray = array();
foreach($people as $person){
foreach($person as $key=>$value){
if(!isset($sortArray[$key])){
$sortArray[$key] = array();
}
$sortArray[$key][] = $value;
}
}
$orderby = "name"; //change this to whatever key you want from the array
array_multisort($sortArray[$orderby],SORT_DESC,$people);
var_dump($people);
?>
Output from first var_dump:
[0]=>
array(3) {
["name"]=>
string(3) "Bob"
["age"]=>
int(8)
["colour"]=>
string(3) "red"
}
[1]=>
array(3) {
["name"]=>
string(4) "Greg"
["age"]=>
int(12)
["colour"]=>
string(4) "blue"
}
[2]=>
array(3) {
["name"]=>
string(4) "Andy"
["age"]=>
int(5)
["colour"]=>
string(6) "purple"
}
}
Output from 2nd var_dump:
array(3) {
[0]=>
array(3) {
["name"]=>
string(4) "Greg"
["age"]=>
int(12)
["colour"]=>
string(4) "blue"
}
[1]=>
array(3) {
["name"]=>
string(3) "Bob"
["age"]=>
int(8)
["colour"]=>
string(3) "red"
}
[2]=>
array(3) {
["name"]=>
string(4) "Andy"
["age"]=>
int(5)
["colour"]=>
string(6) "purple"
}
There's no checking on whether your array keys exist, or the array data you are searching on is actually there, but easy enough to add.
Anonymous ¶
22 years ago
here 2 functions to ksort/uksort an array and all its member arrays
function tksort(&$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);
}
}
}
thegrandoverseer ¶
12 years ago
I wrote this function to sort the keys of an array using an array of keynames, in order.
<?php
/**
* function array_reorder_keys
* reorder the keys of an array in order of specified keynames; all other nodes not in $keynames will come after last $keyname, in normal array order
* @param array &$array - the array to reorder
* @param mixed $keynames - a csv or array of keynames, in the order that keys should be reordered
*/
function array_reorder_keys(&$array, $keynames){
if(empty($array) || !is_array($array) || empty($keynames)) return;
if(!is_array($keynames)) $keynames = explode(',',$keynames);
if(!empty($keynames)) $keynames = array_reverse($keynames);
foreach($keynames as $n){
if(array_key_exists($n, $array)){
$newarray = array($n=>$array[$n]); //copy the node before unsetting
unset($array[$n]); //remove the node
$array = $newarray + array_filter($array); //combine copy with filtered array
}
}
}
$seed_array = array('foo'=>'bar', 'someotherkey'=>'whatev', 'bar'=>'baz', 'baz'=>'foo', 'anotherkey'=>'anotherval');
array_reorder_keys($seed_array, 'baz,foo,bar'); //returns array('baz'=>'foo', 'foo'=>'bar', 'bar'=>'baz', 'someotherkey'=>'whatev', 'anotherkey'=>'anotherval' );
?>
ssb45 at cornell dot edu ¶
19 years ago
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;
}
bimal at sanjaal dot com ¶
10 years ago
An example of reverse sorting a domain name by its name.
<?php
$domains = array(
'sub.domain.com',
'sub2.domain.com',
);
foreach($domains as $d => $domain)
{
$chunks = explode('.', $domain);
krsort($chunks);
echo "\r\n<br>", implode('/', $chunks);
}
/**
* Outputs as:
*
* com/domain/sub
* com/domain/sub2
*/
?>
sbarnum at mac dot com ¶
23 years ago
ksort on an array with negative integers as keys yields some odd results. Not sure if this is a bad idea (negative key values) or what.
serpro at gmail dot com ¶
15 years ago
Here is a function to sort an array by the key of his sub-array.
<?php
function sksort(&$array, $subkey="id", $sort_ascending=false) {
if (count($array))
$temp_array[key($array)] = array_shift($array);
foreach($array as $key => $val){
$offset = 0;
$found = false;
foreach($temp_array as $tmp_key => $tmp_val)
{
if(!$found and strtolower($val[$subkey]) > strtolower($tmp_val[$subkey]))
{
$temp_array = array_merge( (array)array_slice($temp_array,0,$offset),
array($key => $val),
array_slice($temp_array,$offset)
);
$found = true;
}
$offset++;
}
if(!$found) $temp_array = array_merge($temp_array, array($key => $val));
}
if ($sort_ascending) $array = array_reverse($temp_array);
else $array = $temp_array;
}
?>
Example
<?php
$info = array("peter" => array("age" => 21,
"gender" => "male"
),
"john" => array("age" => 19,
"gender" => "male"
),
"mary" => array("age" => 20,
"gender" => "female"
)
);
sksort($info, "age");
var_dump($info);
sksort($info, "age", true);
var_dump($ifno);
?>
This will be the output of the example:
/*DESCENDING SORT*/
array(3) {
["peter"]=>
array(2) {
["age"]=>
int(21)
["gender"]=>
string(4) "male"
}
["mary"]=>
array(2) {
["age"]=>
int(20)
["gender"]=>
string(6) "female"
}
["john"]=>
array(2) {
["age"]=>
int(19)
["gender"]=>
string(4) "male"
}
}
/*ASCENDING SORT*/
array(3) {
["john"]=>
array(2) {
["age"]=>
int(19)
["gender"]=>
string(4) "male"
}
["mary"]=>
array(2) {
["age"]=>
int(20)
["gender"]=>
string(6) "female"
}
["peter"]=>
array(2) {
["age"]=>
int(21)
["gender"]=>
string(4) "male"
}
}
delvach at mail dot com ¶
22 years ago
A real quick way to do a case-insensitive sort of an array keyed by strings:
uksort($myArray, "strnatcasecmp");
Anonymous ¶
11 years ago
Note that this function will output the given $fields in the order they were added to the data array and not automatically in numerical key order.
To output in ascending key order, you'll need to ksort the array first (or use appropriate natural order sorting, depending on your keys).
For example:
<?php
$data[2] = 'C';
$data[0] = 'A';
$data[1] = 'B';
fputcsv($fh, $data); // outputs: "C,A,B"
ksort($data);
fputcsv($fh, $data); // outputs: "A,B,C"
?>
Anonymous ¶
10 years ago
@thegrandoverseer
you could also use the build-in php array functions to get exactly what you want to have:
<?php
$seed_array = array('foo'=>'bar', 'someotherkey'=>'whatev', 'bar'=>'baz', 'baz'=>'foo', 'anotherkey'=>'anotherval');
$keys_array = array('baz', 'foo', 'bar');
$return_array = array_intersect_key($seed_array, array_flip($keys_array)) + array_diff_key($seed_array, array_flip($keys_array));
?>
justin at booleangate dot org ¶
19 years ago
Here's a handy function for natural order sorting on keys.
function natksort($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;
}
stephen [ at ] brooksie-net [ dot ] co [ dot ] uk ¶
11 years ago
ksort and krsort fail to undestand scientific notation, https://bugs.php.net/bug.php?id=43053, therefore when sorting numeric keys, if the key is of the form 0.00001 php will represent it as 1.0E-5.
These methods will assume this to be a string and therefore not organise your array as you may expect.
When using value of this form for array keys use sprintf('%f', 0.00001) to generate the key, for smaller values the precision needs to be included
e.g. sprintf('%0.10f', 0.00000001)
jakub dot lopuszanski at nasza-klasa dot pl ¶
13 years ago
Note that ksort will NOT help you much if numeric and string keys are mixed together.
<?php
$t = array(
"a"=>"A",
0=>"A",
"b"=>"A",
1=>"A"
);
var_dump($t);
ksort($t);
var_dump($t);
?>
produces (on PHP 5.3.6-4 with Suhosin-Patch) :
array(4) {
["a"]=>
string(1) "A"
[0]=>
string(1) "A"
["b"]=>
string(1) "A"
[1]=>
string(1) "A"
}
array(4) {
["b"]=>
string(1) "A"
[0]=>
string(1) "A"
["a"]=>
string(1) "A"
[1]=>
string(1) "A"
}
note that the second array should be sorted by keys, but is even more messed up than the first one!
maik dot riechert at animey dot net ¶
16 years ago
Be careful when using ksort for mixed type keys!!
$a = array(
'first' => true,
0 => 'sally',
);
$b = array(
0 => 'sally',
'first' => true,
);
ksort($a);
ksort($b);
var_dump($a);
var_dump($b);
Output is:
array(
0 => 'sally',
'first' => true,
)
array(
'first' => true,
0 => 'sally',
)
If you want same results for both arrays, use:
ksort($a, SORT_STRING);
The reason for that lays in the compare mechanism which would normally just typecast 'first' to an integer or 0 to a string when comparing it to each other. So you have to use SORT_STRING, otherwise you would lose information when 'first' is converted to int.
centraleffects at yahoo dot com ¶
11 years ago
I wrote this function to sort meta_value in wordpress. I tried a lot of array sorting but neither of them work. But this is not suitable for multidimensional array. This is intended only for wordpress meta_value
The problem is to sort below( the order should be ascending; alphabetically then numerically like A-Z then 0-9):
500-999 users
25-49 users
All Sizes
1-4 users
5-9 users
10-24 users
250-499 users
1000-4999
5000-9999
The solution:
function array_sort($arr){
if(is_array($arr)){
$numeric = array();
$string = array();
foreach($arr as $k => $v)
{
if(isset($v["meta_value"])){
$str = explode(" ",trim($v["meta_value"]));
$firstWord = explode("-",trim($str[0]));
}else{
$str = $v;
$firstWord = explode("-",trim($str));
}
$firstWord = $firstWord[0];
if(is_numeric($firstWord))
{
$numeric[(int)$firstWord] = $v;
}else{
$string[$firstWord] = $v;
}
unset($firstWord);
}
ksort($string,SORT_STRING);
ksort($numeric,SORT_NUMERIC);
return array_merge((array)$string, (array)$numeric);
}
return false;
}
The usage:
$meta =get_post_meta($post_id,$meta_key);
$sorted = array_sort($meta);
The result:
All Sizes
1-4 users
5-9 users
10-24 users
25-49 users
250-499 users
500-999 users
1000-4999
5000-9999
