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);
natcasesort
(PHP 4, PHP 5, PHP 7, PHP 8)
natcasesort — Ordenar un array usando un algoritmo de "orden natural" insensible a mayúsculas-minúsculas
Descripción
natcasesort() es la versión insensible a mayúsculas-minúsculas de natsort().
Esta función implementa un algoritmo de ordenación que ordena las cadenas alfanuméricas en la manera en que lo haría un humano mientras mantiene las asociaciones de clave/valor. Es descrito como "ordenación natural".
Nota:
Si dos miembros se comparan como iguales, su orden relativo en el array oredenado será indefinido.
Parámetros
-
array -
El array de entrada.
Valores devueltos
Devuelve true en caso de éxito o false en caso de error.
Ejemplos
Ejemplo #1 Ejemplo de natcasesort()
<?php
$array1 = $array2 = array('IMG0.png', 'img12.png', 'img10.png', 'img2.png', 'img1.png', 'IMG3.png');
sort($array1);
echo "Ordenación estándar\n";
print_r($array1);
natcasesort($array2);
echo "\nOrdenación de orden natural (insensible a maý-mín)\n";
print_r($array2);
?>El resultado del ejemplo sería:
Ordenación estándar
Array
(
[0] => IMG0.png
[1] => IMG3.png
[2] => img1.png
[3] => img10.png
[4] => img12.png
[5] => img2.png
)
Ordenación de orden natural (insensible a maý-mín)
Array
(
[0] => IMG0.png
[4] => img1.png
[3] => img2.png
[5] => IMG3.png
[2] => img10.png
[1] => img12.png
)
Para más información véase: la página de Martin Pool » Natural Order String Comparison.
Ver también
- natsort() - Ordena un array usando un algoritmo de "orden natural"
- comparación de funciones de orden de arrays
- strnatcmp() - Comparación de strings utilizando un algoritmo de "orden natural"
- strnatcasecmp() - Comparación de strings, insensible a mayúsculas y minúsculas, utilizando un algoritmo de "orden natural"
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User Contributed Notes 6 notes
dslicer at maine dot rr dot com ¶
21 years ago
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>';
?>
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 $result_arr;
}
?>
Hope it will be useful to somebody :)
vbAlexDOSMan at Yahoo dot com ¶
21 years ago
Ulli at Stemmeler dot net: I remade your function -- it's a little more compact now -- Enjoy...
function ignorecasesort(&$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($this));
}
}
shawn at shawnwilkerson dot com ¶
15 years ago
I kept getting varied results using natcasesort and sort on mixed arrays -- per the descriptions.
Sometimes simple is better:
A little snippet of code:
<?php if($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($r);
}
?>
I simply created a lower cased sort field at the front of the result set and then sort by it -- which provides the expected result and leaves the actual needed fields unchanged.
For the curious: all user information is kept completed in another database (and table) from the content database due to security reasons. The getUser functions we have written allow us to pull only what is legally allowed without exposing anything else.
This is why a left join or something wasn't used and we have to build a pseudo result array here from both databases.
tmiller25 at hotmail dot com ¶
22 years ago
add this loop to the function above if you want items which have the same first characters to be listed in a way that the shorter string comes first.
--------------------
/* short before longer (e.g. 'abc' should come before 'abcd') */
for($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;
}
}
--------------------
