Description:
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From manual page: https://php.net/function.array-key-exists
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Hello,

if I am calling array_key_exists on NULL by mistake, the function should return bool FALSE, not NULL. I understand that it shows me a warning, but it also should return bool value as in documentation.

I tested it on PHP version 7.1.33 and 7.4.7

Test script:
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var_dump(array_key_exists('test', NULL));

Expected result:
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By documentation I am expecting to return a bool value, not NULL or you should return an exception, not warning.