php的结构很像是网络服务器接收到一个请求，然后调用php这个程序处理php的脚本，和cgi的性质一样，但是为什么，很多人都把cgi作为一个过时的技术，或者说，将php视作与cgi截然不同的一种结构呢？
他们之间是不是真的有什么本质上的区别呢？
回复内容：
额，首先CGI是外部应用程序与Web服务器之间的接口标准，不同类型语言写的程序只要符合cgi标准，就能作为一个cgi程序与web服务器交互，早期的cgi大多都是c或c++。php可以作为一个cgi使用，作为cgi时，它将作为独立的进程运行，有请求过来就创建一个进程进行响应。当php作为apache的一个模块时，php将作为apache的一个子进程存在，接受apache调用。现在也有了php-fpm+nginx的组合，php-fpm是一个fast-cgi管理器，负责将接收到的请求分配给预先生成的php子程序，管理着php进程。 PHP（Hypertext Preprocessor，超文本预处理器）是一门编程语言，主要用于服务器端的动态页面生成和数据库操作，CGI是它的诸多应用之一。CGI（Common Gateway Interface，通用网关接口）是一种常见的技术，比如我在回答这个问题，点击“提交”之后，这段文本便被浏览器传递到知乎的服务器CGI程序，经过处理之后，别人再打开这个页面就能看到我的回答了。
CGI在服务器端可以用很多语言实现，比如PHP、Python、C/C++、JAVA等等等等。
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