Description:
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The Collator::sortWithSortKeys() method and the collator_sort_with_sort_keys() function have one extra parameter by reflection compared to the documentation ( 
http://php.net/manual/en/collator.sortwithsortkeys.php ).

If we call the method with 2 parameters the following warning is emitted:
Warning: Collator::sortWithSortKeys() expects exactly 1 parameter, 2 given

Test script:
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<?php
$rm = new ReflectionMethod(Collator::class, 'sortWithSortKeys');
var_dump($rm->getNumberOfParameters());
var_dump($rm->getNumberOfRequiredParameters());

$rf = new ReflectionFunction('collator_sort_with_sort_keys');
var_dump($rf->getNumberOfParameters());
var_dump($rf->getNumberOfRequiredParameters());

Expected result:
----------------
int(1)
int(1)
int(2)
int(2)

Actual result:
--------------
int(2)
int(1)
int(3)
int(2)