2008年我买了一本书 书名叫“PHP 6”
上个星期天，我感觉应该整理一下我的书柜。于是，在书柜里，我发现了一本几乎完全忘记的书(我想不起来为什么要买它！)：《PHP 6 ? 快速简洁的Web开发》
这本书出版于2008年一月。而六年之后的今天，PHP的最新版本仍然是5.5 5.6(在我写这篇博客的时候，PHP 5.6发布了，但事实上，这使得PHP 6的诞生更遥不可及)。很显然，这本书的作者是个市场宣传高手(很多人，那些不太清楚PHP的发展的人，今天仍在会去买这本书，以为这是刚刚出版的书)，这似乎也正好反映了一些PHP的发展情况。
根据维基百科上的信息，PHP 5.0发布于2005年。估计PHP 6版本中会在PHP 5的基础上新增一些非常有用的特性，特别是关于对Unicode的支持。但事实上事情并没有像预测的这样发展，很多PHP 6设计中的特性后来都被放到了PHP 5中。9年之后，我们仍然只能使用PHP 5。没错，看起来最近PHP的开发正在加速，传说中的PHPNG(PHP Next Generation)将会在性能上带来大幅度提高(还有很多其它语法上的改进)，它将会做为PHP 7的基础(他们越过了PHP 6，避免与之前的设计路线混淆，比如，我的这本书里讲到的知识)，还有另外一些改进，比如HHVM (PHP即时编译)。
鉴于PHP语言的重要影响（你要知道，WordPress??整个互联网中23%的网站使用的博客系统??是用PHP写的。），我相信，PHP一定会继续向前发展。我对PHP社区并不太了解，不清楚为什么PHP的发展会这么迟缓，但从很多的主机供应商来看，它们为了避免兼容性问题，更喜欢使用老版本的PHP(甚至是那些已经或即将不被支持的版本)。
这样一来，一些流行的软件，例如WordPress，无法再提高它们的最低支持版本(目前的最低要求是PHP 5.2.4)，这就变成了一个鸡和蛋的问题。结果，有超过2千万的用户在他们的网站上仍然使用过期的、含有潜在安全危险的老PHP版本。如果你有时间，可以看看关于这个问题的Twitter讨论(注意讨论的日期)，相信能让你更了解其中复杂的形势。
我们打算在今年3月份停止对PHP进行维护支持。可同时，65%的WordPress网站仍然使用的是PHP 5.2。真不愿看到这样的情况，但没有办法。
? Andrew Nacin (@nacin) December 20, 2012
PHP的不幸现状：我两年前的猜想并没有如愿，PHP 5.2仍然占有39%的份额，而且下降的速度缓慢。 https://t.co/c4ffOZyx7D
? Andrew Nacin (@nacin) August 6, 2014
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