New PCRE function

Hi Internals, I've submitted a small PR proposing a new PCRE function that returns a human-friendly string representation of the last error. https://github.com/php/php-src/pull/5185 Currently there's only preg_last_error() which returns error codes, which isn't really helpful. Most comments in the documentation are about converting those to something more user friendly. https://www.php.net/preg_last_error#usernotes Besides, most extensions provide multiple functions for both use-cases natively, such as: - json (json_last_error / json_last_error_msg) - socket (socket_last_error / socket_strerror) - sqlite (sqlite_last_error / sqlite_error_string) - ldap (ldap_errno / ldap_error) - etc... So I think it makes sense for this function to exist. Any thoughts? Thank you!