✔ default charset is UTF-8 instead of ISO-8859-1 ✔ array to string conversion notice ✔ register_globals completely removed ✔ magic quotes completely removed ✔ removed variable break/continue ✔ max_input_vars (default 1000) ✔ "callable", "insteadof" and "trait" are now reserved words ✔ extending an abstract constructor must match the signature ✔ stream_select() preserves keys of array arg ✔ XSLT writes are disabled by default ✔ mcrypt_generic_end() removed in favour of mcrypt_generic_deinit() ✔ mysql_list_dbs() removed ✔ PDO needs at least mysql client lib 4.1 now ✔ Datetime ignores TZ env var and falls back to UTC if none set ✔ Tiger hash output fixed - See bug 61307