New Extensions

The following new extensions are added (by
default) as of PHP 5.3.0:

• Enchant – An abstraction layer
  above various spelling libraries
• Fileinfo – An improved and
  more solid replacement, featuring full BC, for the Mimetype extension, which
  has been removed.
• INTL – Internationalization extension. INTL is a
  wrapper around the » ICU library.
• Phar – Implementation of PHP-Archive
  files.
• SQLite3 – Support for SQLite
  version 3 databases.

mysqlnd is a new core library shipped with PHP.
It is a PHP-specific replacement for libmysqlclient. mysqlnd will
be used to build the mysql, mysqli and PDO_MySQL extensions if libmysqlclient isn’t found on
the system. It may also be used instead of libmysqlclient even when
libmysqlclient is present. mysqlnd is recommended for all PHP
installations for performance reasons.