PHP 版本讲解_PHP
PHP版本目前主要有分三支：PHP4/PHP5/PHP6
PHP4由于太古老、对OO支持不力已基本被淘汰，不用考虑PHP4。
PHP6由于基本没有生产线上的应用，还基本只是一款概念产品，很多功能已在PHP5.3上实现，所以暂不考虑PHP6。
PHP5的版本目前主要分三支：PHP5.2之前的版本、PHP5.2.x 和 PHP5.3.x
PHP5.2之前的版本不值得考虑，因为某些功能缺陷或者BUG。
主流PHP程序对PHP5.2.x的兼容性最好，而每次版本号的升级带来的都是安全性和稳定性的改善，所以宜挑选最新的版本。目前PHP5.2系列最新的是PHP5.2.17。
而如果产品是自己开发自己使用，PHP5.3在某些方面更具优势，在稳定性上更胜一筹，增加了很多PHP5.2所不具有的功能，比如内置php-fpm、更完善的垃圾回收算法、命名空间的引入、sqlite3的支持等等，是部署项目值得考虑的版本。目前PHP5.3系列最新的是PHP5.3.8。
面向windows的php有以下几个版本
windows版本下载地址：http://windows.php.net/download/
Installer：可执行的MSI格式安装包。
Zip：解压即可用。和install版无区别。建议选择Zip版。
Debug Pack：带调试的php包。
VC6与VC9是什么？
VC6就是legacy Visual Studio 6 compiler，就是使用这个编译器编译的。
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。
提示：使用VC9版的时候需要有VC++2008的运行时环境(x86)。(x64)
提示：不要在apache下使用VC9的版本。
提示：php5.2官方只提供vc6的下载。
提示：php5.3官方提供了vc6和vc9的下载，但从php5.3.5之后只提供vc9版的下载。php5.3.5是最后一个带vc6版的。
TS和NTS是什么？
TS 指 Thread Safe，即线程安全，一般在IIS以ISAPI方式加载的时候选择这个版本。
NTS 指 Non Thread Safe，即非线程安全，一般在IIS以FastCGI方式运行的时候选择这个版本，具有更好的性能。
提示：从PHP 5.3.0 开始发布的Windows版已经不支持ISAPI模式了，下载的php压缩包中没有php5isapi.dll，所以推荐FastCGI方式运行PHP。
如何查看当前运行的PHP的版本？
一个很简单的办法就是phpinfo();
Thread Safety disabled是NTS，enabled是TS
Configure Command看到VC98字样的是VC6，Compiler标明 MSVC9 (Visual C++ 2008) 的是VC9
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