PHP 5.3.1 安装包 VC9 VC6 区别是什么
在PHP100混了这么久也写点东西出来吧，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，可是一看确傻眼了，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ThreadSafe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NonThread Safe版本。
官方并不建议你将NonThread 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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