In this section we describe how to create a home page.
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We begin to understand the CI operating mechanism framework, the following are CI introduction on the official website:
The figure shows the data flow of the system:
- index.php file as a front-end controller, basic resources required to initialize operation CodeIgniter;
- Router checks the HTTP request, to determine how to handle the request;
- If the cache file exists, the output directly to the browser, do not go below the normal system processes;
- Before loading the application controller, an HTTP request and any user-submitted data security checks;
- Loading the controller model, the core library, a helper, and all other resources required to process the request;
- The final step, rendering the view and sent to the browser, if the cache is turned on, the view will first be cached for subsequent requests.
来自 <https://codeigniter.org.cn/user_guide/overview/appflow.html>
1 Modify the CI profiles
1) Open application-> config-> routes.php file;
See $ route [ 'default_controller'] = 'welcome'; default controller shown here are available for purchase , we modify the main
$route['default_controller'] = 'main';
2、创建main控制器及页面
由上面的配置文件我们可以看出，我们需要名称为main的控制器，打开application->controllers文件夹，看到目录下
有一个Welcome.php的文件，这个就是系统默认调用的文件；
1）在application->controllers目录下新建Main.php文件，输入以下代码：
<?php
defined('BASEPATH') OR exit('No direct script access allowed');
class Main extends CI_Controller {
public function index()
{
$this->load->view('main_list');
}
}
2）在application->view目录下新疆main_list.php文件，也就是上面方法中调用的这个文件，输入代码：
<?php
defined('BASEPATH') OR exit('No direct script access allowed');
?><!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>This is my main page</title>
</head>
<body>
<div id="container">
<h1>This is my main page!</h1>
<div id="body">
<p>This is my main page.</p>
</div>
</div>
</body>
</html>
3 运行测试
运行发现主页已经变成了main_list.php的内容了，表示我们的主页就创建成功了；
总结：
本节我们通过修改配置文件，及创建控制器与视图页面，初步完成了主页的创建工作，这里需要充分理解CI的MVC机制，
以及熟悉CI框架配置文件的内容。虽然主页已经创建成功了，但是目前的主页并没有什么用处，我们还需要创建一个真正好看
能用的主页来满足我们的需求，敬请期待下节。
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