PHP 命令行模式

从版本 4.3.0 开始，PHP 提供了一种新类型的 CLI SAPI（Server Application Programming Interface，服务端应用编程端口）支持，名为 CLI，意为 Command Line Interface，即命令行接口

内置Web Server

PHP 5.4.0起， CLI SAPI 提供了一个内置的Web服务器。

这个内置的Web服务器主要用于本地开发使用，不可用于线上产品环境。

URI请求会被发送到PHP所在的的工作目录（Working Directory）进行处理，除非你使用了-t参数来自定义不同的目录。

如果请求未指定执行哪个PHP文件，则默认执行目录内的 index.php 或者 index.html 。如果这两个文件都不存在，服务器会返回 404 错误。

启动Web服务器

$ cd ~/public_html

$ php -S localhost:8000

终端窗口会显示:

PHP 7.1.10 Development Server started at Wed Feb  7 17:12:02 2018
Listening on http://localhost:8888
Document root is D:\DeskTop\public_html
Press Ctrl-C to quit.

接着访问http://localhost:8000/和http://localhost:8000/info.php，窗口会显示：

PHP 7.1.10 Development Server started at Wed Feb  7 17:12:02 2018
Listening on http://localhost:8888
Document root is D:\DeskTop\public_html
Press Ctrl-C to quit.
[Wed Feb  7 17:12:13 2018] ::1:53519 [404]: / - No such file or directory
[Wed Feb  7 17:12:13 2018] ::1:53520 [404]: /favicon.ico - No such file or directory
[Wed Feb  7 17:12:18 2018] ::1:53528 [200]: /info.php
[Wed Feb  7 17:12:42 2018] ::1:53529 Invalid request (Unexpected EOF)
[Wed Feb  7 17:12:42 2018] ::1:53530 Invalid request (Unexpected EOF)
[Wed Feb  7 17:12:42 2018] ::1:53531 Invalid request (Unexpected EOF)

启动时指定根目录

$ cd ~/public_html

$ php -S localhost:8000 -t test/

终端窗口显示

PHP 7.1.10 Development Server started at Wed Feb  7 17:14:26 2018
Listening on http://localhost:8888
Document root is D:\DeskTop\public_html\test
Press Ctrl-C to quit.

使用路由（Router）脚本

请求图片直接显示图片，请求HTML则显示“Welcome to PHP”

<?php
// router.php
if (preg_match('/\.(?:png|jpg|jpeg|gif)$/', $_SERVER["REQUEST_URI"]))
    return false;    // 直接返回请求的文件
else { 
    echo "<p>Welcome to PHP</p>";
}
?>

$ php -S localhost:8000 router.php

执行之后终端显示：

PHP 7.1.10 Development Server started at Wed Feb  7 17:16:56 2018
Listening on http://localhost:8000
Document root is D:\DeskTop\public_html
Press Ctrl-C to quit.
[Wed Feb  7 17:17:33 2018] ::1:53688 Invalid request (Unexpected EOF)
[Wed Feb  7 17:17:33 2018] ::1:53689 Invalid request (Unexpected EOF)
[Wed Feb  7 17:17:47 2018] ::1:53695 Invalid request (Unexpected EOF)
[Wed Feb  7 17:18:04 2018] ::1:53713 Invalid request (Unexpected EOF)
[Wed Feb  7 17:18:04 2018] ::1:53723 [404]: /logo.jpg - No such file or directory
[Wed Feb  7 17:18:08 2018] ::1:53725 [404]: /logo.png - No such file or directory
[Wed Feb  7 17:18:17 2018] ::1:53730 [404]: /mylogo.png - No such file or directory
[Wed Feb  7 17:18:26 2018] ::1:53744 [404]: /mylogo.jpg - No such file or directory
[Wed Feb  7 17:18:44 2018] ::1:53747 Invalid request (Unexpected EOF)
[Wed Feb  7 17:18:47 2018] ::1:53754 [200]: /logo.png