PHP Conference Japan 2024

natcasesort

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

natcasesort Ordina un array usando un algoritmo di "ordine naturale" non sensibile alle maiuscole/minuscole

Descrizione

natcasesort(array $array): void

Questa funziona implementa un algoritmo di ordinamento che ordina le stringhe alfanumeriche come lo farebbe un essere umano, mantenendo le associazioni chiavi/valori. Questo è chiamato "ordine naturale".

natcasesort() è una versione, non sensibile alle maiuscole/minuscole, di natsort().

Example #1 esempio di natcasesort()

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

sort($array1);
echo
"Ordinamento standard\n";
print_r($array1);

natcasesort($array2);
echo
"\nOrdinamento naturale (con maiuscole non significative)\n";
print_r($array2);
?>

Questo codice genererà il seguente risultato:

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

Ordinamento naturale (con maiuscole non significative)
Array
(
    [0] => IMG0.png
    [4] => img1.png
    [3] => img2.png
    [5] => IMG3.png
    [2] => img10.png
    [1] => img12.png
)

Per maggiori informazioni vedere la pagina di Martin Pool » Natural Order String Comparison .

Vedere anche sort(), natsort(), strnatcmp() e strnatcasecmp().

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User Contributed Notes 5 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
-1
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($this));
}
}
up
-5
tmiller25 at hotmail dot com
22 years ago
add this loop to the function above if you want items which have the same first characters to be listed in a way that the shorter string comes first.
--------------------
/* short before longer (e.g. 'abc' should come before 'abcd') */
for($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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