How to implement the routing function of PHP's MVC framework.

Nowadays, PHP is a widely used programming language. As long as you are doing PHP development, you cannot do without some PHP framework. The development framework provides us with flexible development methods, MVC layer separation, business decoupling, etc. , making our development faster and more convenient. However, many people only know how to use the framework, but never understand how the internals of the framework are implemented. This is of no use to improving our programming capabilities. So in this article, we will start with a simpler function, that is to say, the routing function implementation method of the general single-entry box MVC framework. The routes are all structured like this: localhost/MVC/index.php/classname/functionname/var1/var2. The index.php here is usually called the entry file. For the server, what you access here is only the controller called after index.php and the methods in it. Even the value transfer is implemented within the framework based on the PHP level. Next we will simply implement the routing function of the MVC framework.

1. First, establish the MVC file structure

# Let’s try it out and see how we can access the controllers. document.

Enter the following content in index.php:

<?php  
/**  
 * MVC路由功能简单实现 
 * @desc 简单实现MVC路由功能 
 * $Author: Zhihua_W  
 */     
//打印出所有的服务器变量  
print_r($_SERVER);   
?>

Then enter the access address to try. Here I am using the local environment, and the address I access is: localhost/MVC/index.php/class/function/var1. Below I post the two most important variables:

[REQUEST_URI] => /MVC/index.php/class/function/var1  
[SCRIPT_NAME] => /MVC/index.php

2. Index.php file content

<?php  
/** 
 * MVC路由功能简单实现 
 * @desc 简单实现MVC路由功能 
 * $Author: Zhihua_W 
 */  
//定义application路径     
define(&#39;APPPATH&#39;, trim(__DIR__ . &#39;/&#39;));  
//获得请求地址     
$root = $_SERVER[&#39;SCRIPT_NAME&#39;];  
$request = $_SERVER[&#39;REQUEST_URI&#39;];  
$URI = array();  
//获得index.php 后面的地址     
$url = trim(str_replace($root, &#39;&#39;, $request), &#39;/&#39;);  
//如果为空，则是访问根地址     
if (empty($url)) {  
    //默认控制器和默认方法  
    $class = &#39;index&#39;;  
    $func = &#39;welcome&#39;;  
} else {  
    $URI = explode(&#39;/&#39;, $url);  
  
    //如果function为空 则默认访问index     
    if (count($URI) < 2) {  
        $class = $URI[0];  
        $func = &#39;index&#39;;  
    } else {  
        $class = $URI[0];  
        $func = $URI[1];  
    }  
}  
 //把class加载进来     
include(APPPATH . &#39;/&#39; . &#39;application/controllers /&#39; . $class . &#39;.php&#39;);  
  
//实例化->将控制器首字母大写    
$obj = ucfirst($class);  
  
call_user_func_array(  
//调用内部function     
    array($obj, $func),  
    //传递参数     
    array_slice($URI, 2)  
);  
?>

3. Add the following 2 files (index.php, hello.php) to application/controllers

① index.php

<?php
 * MVC路由功能简单实现 
 * @desc 简单实现MVC路由功能 
 * $Author: Zhihua_W 
 */  
class Index  
{  
    function welcome()  
    {  
        # code...  
        echo "default covtroller!";  
    }  
}  
?>

② hello.php

<?php
/** 
 * MVC路由功能简单实现 
 * @desc 简单实现MVC路由功能 
 * $Author: Zhihua_W 
 */  
class Hello{  
    public function index(){  
        echo "hello world!";  
    }  
    public function name($name){  
        echo "hello ".$name;  
    }  
}  
?>  ] view plain copy
<?php  
/**

4. Test

Test to see if you can access it. According to the routing structure above. We can try it. Through testing, we will find that the access is normal, the name method inside the hello class is correctly called, and then the parameter jack is passed. Try not entering the function name again to see if index can be called by default. The answer is also yes. The last one is to visit the root address and see that it is also correctly mapped to the default controller. (The test result pictures are posted without screenshots.)

The above case has been explained. In this way, a simple MVC routing function is completed.

Related recommendations:

What is the MVC framework

Understanding MVC programming in PHP - Introduction to the MVC framework

Use php to build your own mvc framework

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