(PHP 5 >= 5.3.2, PHP 7, PHP 8, PECL intl >= 1.0.3)
Collator::getSortKey -- collator_get_sort_key — Get sorting key for a string
面向对象风格
过程化风格
Return collation key for a string. Collation keys can be compared directly instead of strings, though are implementation specific and may change between ICU library versions. Sort keys are generally only useful in databases or other circumstances where function calls are extremely expensive.
Returns the collation key for the string, 或者在失败时返回 false.
示例 #1 collator_get_sort_key() example
<?php
$s1 = 'Hello';
$coll = collator_create('en_US');
$res = collator_get_sort_key($coll, $s1);
echo bin2hex($res);
?>以上示例的输出类似于：
示例 #2 Collator::getSortKey() example with usort()
<?php
$data = [
[ 'name' => '🇳🇱 Derick Rethans', 'linked_account' => 'https://phpc.social/users/derickr' ],
[ 'name' => 'Elephpant', 'linked_account' => 'https://phpc.social/phpc' ],
[ 'name' => '🇫🇷 Marcus Bointon', 'linked_account' => 'https://phpc.social/users/Synchro' ],
];
/* Create the collator */
$col = new Collator('en');
/* Sort upper-case letters before lower-case letters */
$col->setAttribute(Collator::CASE_FIRST, Collator::UPPER_FIRST);
/* Use a user-defined function with sort, that strips out the emojis */
*/
usort(
$data,
function($a, $b) use ($col) {
/* Remove the character class 'S' (the Symbols), and remove whitespace
* (with trim) */
$aName = trim(preg_replace('/\p{S}+/u', '', $a['name']));
$bName = trim(preg_replace('/\p{S}+/u', '', $b['name']));
/* Create the sort key */
$aKey = $col->getSortKey($aName);
$bKey = $col->getSortKey($bName);
/* Use the sort key to signal which element sorts first */
return $aKey <=> $bKey;
}
);
var_dump($data);
?>以上示例的输出类似于：