Add hash_equals() to ext/hash compat layer
Introduced in PHP 5.6 Beta 1 (unfortunately, still undocumented).
RFC: https://wiki.php.net/rfc/timing_attack
(Yes, I am aware that the RFC talks about hash_compare(), the function was later renamed in the implementation.)
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index edf0a49..db8f7d2 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -525,7 +525,7 @@
- Added `compatibility layers <general/compatibility_functions>` for:
- `Multibyte String <http://php.net/mbstring>`_ (limited support).
- - `Hash <http://php.net/hash>`_ (just ``hash_pbkdf2()``).
+ - `Hash <http://php.net/hash>`_ (``hash_equals()``, ``hash_pbkdf2()``).
- `Password Hashing <http://php.net/password>`_.
- `Array Functions <http://php.net/book.array>`_ (``array_column()``, ``array_replace()``, ``array_replace_recursive()``).