natcasesort
(PHP 4, PHP 5)
natcasesort — Сортирует массив, используя алгоритм "natural order" без учета регистра символов
Описание
&$array
)natcasesort() - это регистронезависимый аналог natsort().
Эта функция реализует алгоритм сортировки, при котором порядок буквенно-цифровых строк будет привычным для человека. Такой алгоритм называется "natural ordering".
Список параметров
-
array
-
Входной массив.
Возвращаемые значения
Возвращает TRUE
в случае успешного завершения или FALSE
в случае возникновения ошибки.
Примеры
Пример #1 Пример использования natcasesort()
<?php
$array1 = $array2 = array('IMG0.png', 'img12.png', 'img10.png', 'img2.png', 'img1.png', 'IMG3.png');
sort($array1);
echo "Обычная сортировка\n";
print_r($array1);
natcasesort($array2);
echo "\nNatural order сортировка (без учета регистра)\n";
print_r($array2);
?>
Результат выполнения данного примера:
Обычная сортировка Array ( [0] => IMG0.png [1] => IMG3.png [2] => img1.png [3] => img10.png [4] => img12.png [5] => img2.png ) Natural order сортировка (без учета регистра) Array ( [0] => IMG0.png [4] => img1.png [3] => img2.png [5] => IMG3.png [2] => img10.png [1] => img12.png )
Подробнее смотри статью Martin Pool » Natural Order String Comparison.
Смотрите также
- natsort() - Сортирует массив, используя алгоритм "natural order"
- Сравнение функций сортировки массивов
- strnatcmp() - Сравнение строк с использованием алгоритма "natural order"
- strnatcasecmp() - Сравнение строк без учета регистра с использованием алгоритма "natural order"
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Коментарии
add this loop to the function above if you want items which have the same first characters to be listed in a way that the shorter string comes first.
--------------------
/* short before longer (e.g. 'abc' should come before 'abcd') */
for($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; $i+=2;
}
}
--------------------
Something that should probably be documented is the fact that both natsort and natcasesort maintain the key-value associations of the array. If you natsort a numerically indexed array, a for loop will not produce the sorted order; a foreach loop, however, will produce the sorted order, but the indices won't be in numeric order. If you want natsort and natcasesort to break the key-value associations, just use array_values on the sorted array, like so:
natcasesort($arr);
$arr = array_values($arr);
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($this));
}
}
Here a function that will natural sort an array by keys with keys that contain special characters.
<?php
function natksort($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 $result_arr;
}
?>
Hope it will be useful to somebody :)
I kept getting varied results using natcasesort and sort on mixed arrays -- per the descriptions.
Sometimes simple is better:
A little snippet of code:
<?php if($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.
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>';
?>