natcasesort

(PHP 4, PHP 5, PHP 7, PHP 8)

natcasesortOrdena um array utilizando o algoritmo da "ordem natural" sem diferenciar maiúsculas e minúsculas

Descrição

natcasesort(array &$array): true

natcasesort() é uma versão case-insensitive (não diferencia letras maiúsculas de minúsculas) da natsort().

Essa função implementa o algoritmo de ordenação que ordena strings alfanuméricas da forma que os humanos fariam mantendo associação de chave/valor. Essa forma de ordenação é denominada "ordenação natural".

Nota:

Se dois elementos são comparados como iguais, eles mantêm sua ordem original. Antes do PHP 8.0.0, sua ordem relativa no array ordenado era indefinida.

Nota:

Redefine o ponteiro interno do array para o primeiro elemento.

Parâmetros

array

O array de entrada.

Valor Retornado

Sempre retorna true.

Registro de Alterações

Versão Descrição
8.2.0 O tipo do retorno agora é true; anteriormente, era bool.

Exemplos

Exemplo #1 Exemplo da natcasesort()

<?php
$array1
= $array2 = array('IMG0.png', 'img12.png', 'img10.png', 'img2.png', 'img1.png', 'IMG3.png');

sort($array1);
echo
"Standard sorting\n";
print_r($array1);

natcasesort($array2);
echo
"\nNatural order sorting (case-insensitive)\n";
print_r($array2);
?>

O exemplo acima produzirá:

Standard sorting
Array
(
    [0] => IMG0.png
    [1] => IMG3.png
    [2] => img1.png
    [3] => img10.png
    [4] => img12.png
    [5] => img2.png
)

Natural order sorting (case-insensitive)
Array
(
    [0] => IMG0.png
    [4] => img1.png
    [3] => img2.png
    [5] => IMG3.png
    [2] => img10.png
    [1] => img12.png
)

Para mais informação veja: Martin Pool's » Natural Order String Comparison page.

Veja Também

add a note

User Contributed Notes 6 notes

up
44
dslicer at maine dot rr dot com
21 years ago
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:

natcasesort($arr);
$arr = array_values($arr);
up
3
w-dot-rosenbach-at-netskill-de
13 years ago
Sorting UTF-8 by arbitrary order:

<?php
mb_internal_encoding
("UTF-8");

class
utf_8_german
{
// everything else is sorted at the end
static $order = '0123456789AaÄäBbCcDdEeFfGgHhIiJjKkLlMm
NnOoÖöPpQqRrSsßTtUuÜüVvWwXxYyZz'
;
static
$char2order;

static function
cmp($a, $b) {
if (
$a == $b) {
return
0;
}

// lazy init mapping
if (empty(self::$char2order))
{
$order = 1;
$len = mb_strlen(self::$order);
for (
$order=0; $order<$len; ++$order)
{
self::$char2order[mb_substr(self::$order, $order, 1)] = $order;
}
}

$len_a = mb_strlen($a);
$len_b = mb_strlen($b);
$max=min($len_a, $len_b);
for(
$i=0; $i<$max; ++$i)
{
$char_a= mb_substr($a, $i, 1);
$char_b= mb_substr($b, $i, 1);

if (
$char_a == $char_b) continue;
$order_a = (isset(self::$char2order[$char_a])) ? self::$char2order[$char_a] : 9999;
$order_b = (isset(self::$char2order[$char_b])) ? self::$char2order[$char_b] : 9999;

return (
$order_a < $order_b) ? -1 : 1;
}
return (
$len_a < $len_b) ? -1 : 1;
}
}

// usage example:

$t = array(
'Birnen', 'Birne', 'Äpfel', 'Apfel',
);

uasort($t, 'utf_8_german::cmp');
echo
'$t: <pre>'.htmlspecialchars(print_r($t,true),null,'UTF-8').'</pre>';
?>
up
-1
claude at schlesser dot lu
15 years ago
Here a function that will natural sort an array by keys with keys that contain special characters.

<?php
function natksort($array)
{
$original_keys_arr = array();
$original_values_arr = array();
$clean_keys_arr = array();

$i = 0;
foreach (
$array AS $key => $value)
{
$original_keys_arr[$i] = $key;
$original_values_arr[$i] = $value;
$clean_keys_arr[$i] = strtr($key, "ÄÖÜäöüÉÈÀËëéèàç", "AOUaouEEAEeeeac");
$i++;
}

natcasesort($clean_keys_arr);

$result_arr = array();

foreach (
$clean_keys_arr AS $key => $value)
{
$original_key = $original_keys_arr[$key];
$original_value = $original_values_arr[$key];
$result_arr[$original_key] = $original_value;
}

return
$result_arr;
}
?>

Hope it will be useful to somebody :)
up
-3
vbAlexDOSMan at Yahoo dot com
20 years ago
Ulli at Stemmeler dot net: I remade your function -- it's a little more compact now -- Enjoy...

function ignorecasesort(&$array) {

/*Make each element it's lowercase self plus itself*/
/*(e.g. "MyWebSite" would become "mywebsiteMyWebSite"*/
for ($i = 0; $i < sizeof($array); $array[$i] = strtolower($array[$i]).$array[$i], $i++);

/*Sort it -- only the lowercase versions will be used*/
sort($array);

/*Take each array element, cut it in half, and add the latter half to a new array*/
/*(e.g. "mywebsiteMyWebSite" would become "MyWebSite")*/
for ($i = 0; $i < sizeof($array); $i++) {
$this = $array[$i];
$array[$i] = substr($this, (strlen($this)/2), strlen($this));
}
}
up
-6
shawn at shawnwilkerson dot com
15 years ago
I kept getting varied results using natcasesort and sort on mixed arrays -- per the descriptions.

Sometimes simple is better:

A little snippet of code:

<?php if($responders->num_rows) {
$i=0;
while(
$row= $responders->fetch_assoc()) {
$user=getUserName($row['responderID']);
$r[$i]= array("sortname"=>strtolower($user),"userName"=>$user, "userID"=>$row['responderID'], "responderID"=>$row['idresponders']);
$i++;
}
sort($r);
print_r($r);
}

?>

I simply created a lower cased sort field at the front of the result set and then sort by it -- which provides the expected result and leaves the actual needed fields unchanged.

For the curious: all user information is kept completed in another database (and table) from the content database due to security reasons. The getUser functions we have written allow us to pull only what is legally allowed without exposing anything else.

This is why a left join or something wasn't used and we have to build a pseudo result array here from both databases.
up
-5
tmiller25 at hotmail dot com
22 years ago
add this loop to the function above if you want items which have the same first characters to be listed in a way that the shorter string comes first.
--------------------
/* short before longer (e.g. 'abc' should come before 'abcd') */
for($i=count($array)-1;$i>0;$i--) {
$str_a = $array[$i ];
$str_b = $array[$i-1];
$cmp_a = strtolower(substr($str_a,0,strlen($str_a)));
$cmp_b = strtolower(substr($str_b,0,strlen($str_a)));
if ($cmp_a==$cmp_b && strlen($str_a)<strlen($str_b)) {
$array[$i]=$str_b; $array[$i-1]=$str_a; $i+=2;
}
}
--------------------
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