. The hash_hmac(), hash_hmac_file() and hash_pbkdf2() functions no longer
accept non-cryptographic hashes.
+- JSON
+ . The json_decode() option JSON_OBJECT_AS_ARRAY is used if the second
+ parameter (assoc) is null. Previously JSON_OBJECT_AS_ARRAY was always
+ ignored.
+
- PCRE:
. preg_match() and other PCRE functions now distinguish between unmatched
subpatterns and empty matches by reporting NULL and "" (empty string),