PHP 5.4 Changes

From the PHP 5.4.0 RC1 "NEWS" file.

• Traits
• Class member access on instantiation: (new Foo)->bar()
• Short array syntax: ['blue', 'red']
• ext/mysql, mysqli and pdo_mysql now use mysqlnd by default
• New typehint: function( callable $callback )
• Closure::bind() and Closure::bindTo()
• Class::{"foo$bar"}()
• Method call through array: $cb = array($obj, 'method'); $cb( $args );
• Built-in web server: php -S localhost:8080
• <?= is now always available regardless of the short_open_tag setting (pure PHP templates ftw)

In addition to safe mode being removed, there's also this:

Removed magic_quotes_gpc, magic_quotes_runtime and magic_quotes_sybase ini options. get_magic_quotes_gpc, get_magic_quotes_runtime are kept but always return false, set_magic_quotes_runtime raises an E_CORE_ERROR. (Pierrick, Pierre)