[Disccusion] Introduce error_clear_last() function

Hi internals, I would like to implement FR #45235. below copied from Github. What do you think about it? ----- You can view the Pull Request on github: https://github.com/php/php-src/pull/1135 Pull Request Description: In PHP a simple assign expression would raise error, if user use error_get_last() to check they can't guarantee the call site raise the error. This patch implement a function to clear the error state. http://php.net/error_get_last The top voted user contributed note are a tricky way to clear last error. also there are a lot of apps use the similar hacks. 1. https://github.com/mathnerd3141/doeqs_new/blob/ba23c478a0c819dc6b2f8f96f9df35d16505eed2/errors.php#L20 2. https://github.com/benfinke/cargo_plane/blob/4911bc6a91d8345aa62c81fb52c8bed9d216c44e/Splunk/Util.php#L89 Request: https://bugs.php.net/bug.php?id=45235 -- Reeze Xia http://reeze.cn