Xdebug如何选择PHP版本
先上个图，来个看图不说话，大家通过这个图能看个大概 PHP从5.2.10开始，区分线程安全和非线程安全2个 版本 。我们就从这两个的区别说起。所谓线程安全（Thread Safe）就是执行时会进行线程安全检查，以防止有新请求时就启动新线程的CGI执行方式耗尽系统资源
先上个图，来个看图不说话，大家通过这个图能看个大概
PHP从5.2.10开始，区分线程安全和非线程安全2个版本。我们就从这两个的区别说起。所谓线程安全（Thread Safe）就是执行时会进行线程安全检查，以防止有新请求时就启动新线程的CGI执行方式耗尽系统资源。非线程安全（None Thread Safe）就是在执行时不进行线程安全检查。
PHP在IIS上运行PHP有ISAPI和FastCGI两种形式（如果是wamp，运行方式是FastCGI）。FastCGI执行方式是以单线程来执行的，所以无需进行线程安全检查，IIS7集成了FastCGI,IIS6也支持，如果是采用FastCGI运行PHP，建议采用非线程安全（None Thread Safe）版本将获得更高的执行效率。
ISAPI执行方式是以DLL动态库的形式使用的，在处理完用的一个请求后不会立即消失，而是继续驻留内存等待处理别的用户请求，直到一段时间后没有用户请求。所以需要进行线程安全检查。安装肯定就是选择TS版本
VC6版本是采用Visual Studio6精心编译的，适合Apache架设的服务器
VC9版本是采用Visual Studio2008进行编译的，适合IIS假设的服务器
参考资料：
Difference between PHP thread safe and non thread safe binaries
CGI / FASTCGI / ISAPI 区别
php non-thread-safe与thread-safe
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