How to learn MVC framework in PHP

When it comes to PHP web development, it is naturally inseparable from the development framework. The development framework provides us with flexible development methods, MVC layer separation, business decoupling, etc. This article mainly introduces the relevant information for learning MVC framework routing in PHP. Friends in need can refer to it. I hope to be helpful.

The first article is simpler and talks about the routing function of the MVC framework. . .

General single-entry framework routing has this structure:

domain/index.php/classname/functionname/var1/var2

The index.php here is 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.

Talk is cheap, show you the code !!

First of all, establish the following file structure

Let’s try it out, how? To access the files in controllers. . .

Enter the following content in index.php

print_r($_SERVER);

Then try visiting the following address.

yourdomain/index.php/class/function/var1

The author here uses the local environment, and the address I visit is localhost/MVC/index.php/class/function/var1

I posted the two most important variables

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

In fact, the most basic principle of routing is here:

Use these two variables to extract the class, function, parameters, etc. in the url address, and then put the class include comes in, calls the corresponding function and passes the corresponding parameters through the PHP callback function call_user_func_array.

Next is the code. Reading the code should be easier to understand than what I wrote. Haha~~

index.php content is as follows:

<?php 
# 定义application路径 
define(‘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, ”, $request), ‘/&#39;); 
# 如果为空，则是访问根地址 
if (empty($url)) 
{ 
# 默认控制器和默认方法 
$class = ‘index&#39;; 
$func = ‘welcome&#39;; 
} 
else 
{ 
$URI = explode(‘/&#39;, $url); 
# 如果function为空 则默认访问index 
if (count($URI) < 2) 
{ 
$class = $URI[0]; 
$func = ‘index&#39;; 
} 
else 
{ 
$class = $URI[0]; 
$func = $URI[1]; 
} 
} 
# 把class加载进来 
include(APPPATH . ‘/&#39; . ‘application/controllers/&#39; . $class . ‘.php&#39;); 
#实例化 
$obj = new ucfirst($class); 
call_user_func_array( 
# 调用内部function 
array($obj,$func), 
# 传递参数 
array_slice($URI, 2) 
);

Add the following 2 files in application/controllers

index.php is used as the default controller

<?php 
class Index 
{ 
function welcome() 
{ 
echo ‘I am default controller&#39;; 
} 
} 
?> 
hello.php
<?php 
class Hello 
{ 
public function index() 
{ 
echo ‘hello world&#39;; 
} 
public function name($name) 
{ 
echo ‘hello ‘ . $name; 
} 
} 
?>

Test and see if you can access it. According to the routing structure above. Let's try

This access is normal, the name method inside the hello class is correctly called, and then the parameter barbery is passed. . .

Try again without entering the function name and see if you can call index by default. .

The answer is also yes. . .

Last one, visit the root address to see if

is also correctly mapped to the default controller. . .

ok, a simple MVC routing function is completed. . .

Related recommendations:

PHP MVC Framework Core Class

Notes on writing your own PHP MVC framework

Analysis of the implementation of PHP MVC pattern in website architecture_PHP tutorial

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