Description
Applications running on PHP 8.4 can handle multibyte text correctly for Unicode and East Asian encodings. This runtime extension is needed by many frameworks, CMS platforms, forms, mail workflows, and search features that manipulate user-visible strings. It is dependency-only and has no separate launcher; PHP code calls mbstring functions when enabled. Encoding assumptions and invalid byte sequences should be handled carefully to avoid broken text, bad length checks, or validation bypasses.