(PHP 5 >= 5.3.2, PHP 7, PECL intl >= 1.0.3)
Collator::getSortKey -- collator_get_sort_key — Get sorting key for a string
Object oriented style
$str
) : stringProcedural style
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, or FALSE on failure.
This function may
return Boolean FALSE, but may also return a non-Boolean value which
evaluates to FALSE. Please read the section on Booleans for more
information. Use the ===
operator for testing the return value of this
function.
| Version | Description |
|---|---|
| 5.3.15, 5.4.5 |
Sort keys do no longer contain any NUL bytes.
|
Example #1 collator_get_sort_key()example
<?php
$s1 = 'Hello';
$coll = collator_create('en_US');
$res = collator_get_sort_key($coll, $s1);
echo bin2hex($res);
?>
The above example will output something similar to: