Description:
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As per #80548, it is expected that @error_reporting() returns junk but I would still expect it to change the error_reporting value when passed an argument. It does not do that on PHP 8.

Not sure why was error_reporting silenced in the codebase in the first place, maybe it could trigger some undocumented errors in the past. Or maybe the author was just being overly cautious.

Possibly related #75924

Test script:
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<?php
// demo: https://3v4l.org/odVHc

var_dump(error_reporting(E_ALL));
var_dump(error_reporting());
var_dump(@error_reporting(E_ERROR));
var_dump(error_reporting()); // does not returns E_ERROR on PHP 8.0

Expected result:
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The last line should return E_ERROR as it does on PHP < 8.

Actual result:
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It returns E_ALL.