Description:
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From manual page: http://php.net/manual/ru/array.sorting.php
http://php.net/manual/en/array.sorting.php

Table with columns:
Function name / Sorts by Maintains / key association / Order of sort / Related functions

English variant (correct):
natcasesort() / value / yes / natural, case insensitive / natsort()

Russian translation (incorrect):
natcasesort() / ключу / да / натуральный, чувствителен к регистру / natsort()

it is written in Russian that natcasesort() sorts by "key".

In Russian translation the word "key" should be substituted by the word "value".

Correct variant is in English, reference given above.