[php-src] PR #23726: ext/standard: Optimize & Refactor pathinfo()

Pull Request: https://github.com/php/php-src/pull/23726 Author: LamentXU123 I try to rewrite the whole function because I don't think it's very much well written. My implementation includes: - Reuse the basename string for PATHINFO_BASENAME and extensionless PATHINFO_FILENAME results. - Share the last-dot lookup for extension and filename when returning PATHINFO_ALL. This implementation is faster then the original one in various aspect. pathinfo('/var/www/html/index.php', PATHINFO_BASENAME)：46% lower runtime pathinfo('/var/www/html/index.php', PATHINFO_EXTENSION)：35% lower runtime pathinfo('/var/www/html/index.php', PATHINFO_FILENAME)：40% lower runtime pathinfo('/var/www/html/README', PATHINFO_FILENAME)：52% lower runtime And no regressions iintended. I am wondering why agents scanning this stuff can't find the idea to rewrite this function. Perhaps I am making some mistakes.