The utf8_encode() and utf8_decode()
functions have now been moved to the standard extension as string functions, whereas before
the XML extension was required for them to be available.
The DBA extension now has support for LMDB.
Changes to the PHP build system
Unix: Autoconf 2.64 or greater is now required to build PHP.
Unix: --with-pdo-oci configure argument no longer needs
the version number of the Oracle Instant Client.
Unix: --enable-gd-native-ttf configure argument has been
removed. This was not used since PHP 5.5.0.
Windows: --with-config-profile configure argument has been
added. This can be used to save specific configures, much like the magical
Changes to GD
imageantialias() is now also available if compiled with
a system libgd.
imagegd() stores truecolor images as real truecolor
images. Formerly, they have been converted to palette.
Moving MCrypt to PECL
The MCrypt extension has now been moved
out of the core to PECL. Given the mcrypt library has not seen any updates
since 2007, its usage is highly discouraged. Instead, either the
OpenSSL or Sodium
extension should be used.