thinkphp overrides base class methods

In the ThinkPHP5 framework, the base class (Base) is a very important class. It is the parent class of all controllers and contains many important methods, such as: controller initialization, template rendering, template output, etc. In actual development, we sometimes need to rewrite some methods in the base class to meet our specific business needs. So, how to override base class methods in the ThinkPHP5 framework? I'll go into detail below.

The first step is to find the base class file

In the ThinkPHP5 framework, the base class (Base) file is in "thinkController.php". The default directory of this file is "/thinkphp/library/think/", and the file can also be found through "topthink/framework" installed by composer. Therefore, we need to find the base class file of the controller before we can modify it.

The second step is to write a custom method

Before overriding the base class method, we need to write a custom method. The code logic of this method needs to be written according to actual business needs, and it can be called anywhere needed in the controller. For example, we need to determine whether the current user is logged in before the controller outputs. If the current user is not logged in, jump to the login page.

The specific operations are as follows:

<?php
namespace appindexcontroller;
use thinkController;

class Base extends Controller
{
    public function _initialize()
    {
        parent::_initialize();
        // ...
    }
    
    public function index()
    {
        // ...
    }

    public function checkLogin()
    {
        // 判断用户是否登录
        if(!session('?user_id')) {
            $this->redirect('user/login');
        }
    }
}

In the above sample code, we wrote a custom method named "checkLogin" to determine whether the user is logged in. When the user is not logged in, this method will jump to the specified login page through the redirect method.

The third step is to rewrite the base class method

After writing our own custom method, we can rewrite the base class method. The base class methods in the ThinkPHP5 framework are all protected or public type methods. You can usually achieve your own business needs by inheriting the base class and overriding the base class methods. For example, we need to determine whether the current user is logged in before the controller outputs. If already logged in, there is no need to jump.

The specific operations are as follows:

<?php
namespace appindexcontroller;
use thinkController;

class Base extends Controller
{
    public function _initialize()
    {
        parent::_initialize();

        $this->checkLogin(); // 调用自定义方法检测用户是否登录
    }
    
    public function index()
    {
        // ...
    }

    // 重写基类的redirect方法
    protected function redirect($url, $params = array(), $code = 302, $with_prefix = false)
    {
        // 当前用户已登录，则直接输出模板
        if(session('?user_id')) {
            parent::redirect($url, $params, $code, $with_prefix);
        }
        // 当前用户未登录，则跳转至登录页面
        else {
            parent::redirect('user/login');
        }
    }
}

In the above example code, we override the redirect method of the base class to determine whether the current user is logged in. When the user is logged in, the template will be output directly; when the user is not logged in, it will automatically jump to the login page.

Summary

In the ThinkPHP5 framework, rewriting base class methods can help us realize our own business needs. Overriding base class methods needs to follow the signature and semantics of the base class method, and the implementation of the base class method needs to be carefully analyzed before modification. Rewriting the base class method needs to be done in the controller. The specific steps include: first writing your own custom method; then rewriting the base class method; and finally calling the custom method where needed.

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