Tommy Code

据PHP官方报税PHP 5.4 alpha1 版已经发布了，下面就介绍一这个版本的新特性：

Added: Traits language construct

新的语法结构，trait，用法看这里：https://wiki.php.net/rfc/traits

Added: Array dereferencing support

以后可以这样用了

function fruit()
{
    return array('a' => 'apple', 'b' => 'banana');
}
echo fruit()['a'];

Added: DTrace support

DTrace是一个性能分析工具, 可以跟踪出函数调用点,返回点等数据.具体可以查看：http://blog.experimentalworks.net/2010/04/php-5-3-99-dev-and-dtrace-part-i/

Improved: Improved Zend Engine memory usage and performance

Moved: ext/sqlite moved to pecl (sqlite3 support is still built-in)

Please note that some legacy features have been removed, including:

Removed: break/continue $var syntax

Removed: register_globals, allow_call_time_pass_reference, and register_long_arrays ini options

Removed: session_is_regisitered(), session_registered(), and session_unregister()