PHP 5.3.1 安装包 VC9 VC6不同版本的区别是什么
php官网提供了四个版本，VC9 x86 Non Thread Safe、VC9 x86 Thread Safe、VC6 x86 Non Thread Safe、VC6 x86 Thread Safe，大家看完这篇文章就知道应该选择什么样的版本了。
最近在PHP官网上看到又有新版的PHP下载了，于是上去找找 For Windows的版本，可是一看，一共给了四个版本，VC9 x86 Non Thread Safe、VC9 x86 Thread Safe、VC6 x86 Non Thread Safe、VC6 x86 Thread Safe，这让我这个菜鸟头疼啊，还好PHP官网提供下载的地方左边有个英文choose我看懂了，我估摸着就是如何来选择版本的意思吧，于是开始查字典 及上网查找，终于看明白了具体意思，拿来做个备忘先。 再给PHP100做个广告，据说老大要出视频演示了，我就简单解释一下。
一、如何选择PHP5.3的VC9版本和VC6版本
VC6是什么？
VC6就是legacy Visual Studio 6 compiler，就是使用这个编译器编译的。
VC9是什么？
VC9就是the Visual Studio 2008 compiler，就是用微软的VS编辑器编译的。
那我们如何选择下载哪个版本的PHP呢？
如果你是在windows下使用Apache+PHP的，请选择VC6版本；
如果你是在windows下使用IIS+PHP的，请选择VC9版本。
二、如何选择PHP5.3的Thread Safe和Non Thread Safe版本
先从字面意思上理解，Thread Safe是线程安全，执行时会进行线程（Thread）安全检查，以防止有新要求就启动新线程的CGI执行方式而耗尽系统资源。Non Thread Safe是非线程安全，在执行时不进行线程（Thread）安全检查。
再来看PHP的两种执行方式：ISAPI和FastCGI。
ISAPI执行方式是以DLL动态库的形式使用，可以在被用户请求后执行，在处理完一个用户请求后不会马上消失，所以需要进行线程安全检查，这样来提高程 序的执行效率，所以如果是以ISAPI来执行PHP，建议选择Thread Safe版本；
而FastCGI执行方式是以单一线程来执行操作，所以不需要进行线程的安全检查，除去线程安全检查的防护反而可以提高执行效率，所以，如果是以 FastCGI来执行PHP，建议选择Non Thread Safe版本。
官方并不建议你将Non Thread Safe 应用于生产环境，所以我们选择Thread Safe 版本的PHP来使用。
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