Case insensitive in associative array?

Question

PHP

I am writing a bot for the VKontakte community in php.
But I ran into a problem.
There is an associative array of the form "Question"=>"Answer"
In this array, the Question is written with a capital letter, is it possible to make it possible to write both an array and an ARRAY ???
Don't offer to create a "clone" of an array string with a different case.
PY SY Tried already to do so "Question", "QUESTION", "question" => "Answer", does not work (
You are the last hope

Answer 1

Before using an associative array, convert all keys to lower case using the php.net/manual/fr/function.strtolower.php function and that's it.

$key = "Вопрос";
$key = strtolower($key);

echo $arr[$key];