[php-src] Issue #9431: DateTime::getLastErrors() not returning false when no errors/warnings

Issue: https://github.com/php/php-src/issues/9431 Author: Quirinus ### Description ### Code The following code: ```php <?php $dateTime = DateTime::createFromFormat('Y-m-d', '2022-08-26'); $lastErrors = DateTime::getLastErrors(); var_dump($lastErrors); ``` Resulted in this output: ``` array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } ``` But I expected this output instead: ``` bool(false) ``` ### Discussion I'm not sure if this is a documentation issue or a PHP bug. The documentation says that the return type of DateTime::getLastErrors() is array|false. array is returned if there are errors and/or warnings, while false is returned if there's no errors nor warnings. In actuality, false is not returned even when there are no errors/warnings - the array is returned instead, as can be seen in the above example. ### PHP Version PHP 8.1.8, PHP 7.4.30 ### Operating System _No response_