The PHP development team is proud to announce the immediate availability of PHP 5.4.0. This release is a major leap forward in the 5.x series, which includes a large number of new features and bug fixes.
Some of the key new features include: traits, a shortened array syntax, a built-in webserver for testing purposes and more. PHP 5.4.0 significantly improves performance, memory footprint and fixes over 100 bugs.
For users upgrading from PHP 5.3 there is a migration guide available here, detailing the changes between those releases and PHP 5.4.0.
Further details about the PHP 5.4.0 release can be found in the release announcement, and the full list of changes are available in the ChangeLog.
Please note that it may take a while until the release is available on all mirrors.
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你还在犹豫什么？而且，传说中性能提高了超级多，20倍？50倍？太夸张了，不过提升一点点我还是可信的
diogin在大致浏览了下，稍作了整理：
增加 cli-server SAPI
FPM SAPI 增加 process.max 配置项
增加 http_response_code(), get_declared_traits(), trait_exists(), header_register_callback(), class_uses() 函数
增加 Closure::bind(), Closure::bindTo() 方法
mysql, mysqli 扩展默认使用 mysqlnd
增加 trait
增加关键字 callable，insteadof
E_ALL 包含了 E_STRICT
增加了 <?=
支持 (new Foo)->bar()
支持 0b001001101
支持 $a = [1, 2, 3, 4]; $b = ['one' => 1, 'two' => 2, 'three' => 3];
支持 Class::{expr}()
支持 foo()[0]
闭包里支持 $this 引用
continue $v，break $v 不再支持
缺省时区设为 UTC
缺省编码设为 UTF-8
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一个MINI的测试server还是有点用的。难道它也想象nodejs那样？谁知道呢