Let's talk about the concept and usage of ThinkPHP encapsulation method

ThinkPHP is a very popular PHP open source framework. Its excellent MVC architecture and rich encapsulation methods make development more efficient and simpler. This article will introduce the concept and usage of ThinkPHP encapsulation method to help developers better understand and use the ThinkPHP framework.

1. What is the encapsulation method?

In programming, in order to facilitate use and improve code reusability, we often encapsulate a certain piece of code into a function or method. In the ThinkPHP framework, encapsulation methods (including functions and class methods) can be regarded as secondary encapsulation of the core library of the framework. Developers can write and call encapsulation methods according to their own needs, improving code reusability and development efficiency.

2. Classification of ThinkPHP encapsulation methods

ThinkPHP encapsulation methods can be divided into two types: functions and class methods.

2.1 Function

A function refers to a set of specific statement blocks with a certain function, which can receive input parameters and return results. In the ThinkPHP framework, encapsulated functions are generally placed in the framework directory \Think\Common\functions.php. These functions can be easily introduced into the project through include files. For example, the following is a function code for verifying a mobile phone number:

function check_mobile($mobile){
    $regex = "/^1[34578]{1}\d{9}$/";
    return preg_match($regex, $mobile);
}

2.2 Class method

A class is a structure that encapsulates properties and methods and has the characteristics of object-oriented programming. In the ThinkPHP framework, encapsulated class methods are mainly reflected in the controller class (Controller), for example:

class IndexController extends Controller {
    
    public function index(){
        $data = [
            'name' => 'Tom',
            'age'  => 18,
        ];
        $this->assign('data', $data);
        $this->display();
    }
    
}

The above code is the index method in the Index controller, which assigns the $data variable to $data variable in the template, and display the template through the display method.

3. How to customize the encapsulation method

During the development process, we usually need to customize some functions or class methods to meet our own business needs. The following takes a custom function as an example to introduce how to customize the encapsulation method.

3.1 Customization of functions

Place the custom function in the framework directory\Think\Common\functions.php and ensure that the file is imported. For example, the following is a custom function for calculating the area of ​​a circle:

function circle_area($r){
    return pi() * $r * $r;
}

This function can be called at any location through the function name circle_area(), for example:

echo circle_area(5);//输出78.539816339745

3.2 Customization of class methods Definition

Similar to custom functions, we can also customize controller class methods and other class methods. The following is an example of a custom Dao class:

class Dao{
    
    public function query($sql){
        //执行查询并返回结果
    }
    
    public function execute($sql){
        //执行非查询SQL语句
    }
}

We can define custom classes Place it in any location, for example, place the Dao class in \App\Common\Dao.php, and then introduce it into the class that needs to be used through the use statement, for example:

namespace App\Controller;

use Think\Controller;
use App\Common\Dao;

class IndexController extends Controller {
    
    public function index() {
        $dao = new Dao();
        $result = $dao->query('select * from user');
        $this->assign('result', $result);
        $this->display();
    }
}

In this code, we pass the new statement An instance of the Dao class $dao is created, and the user data is queried by calling the query method, and the result is assigned to the template variable $result through the assign method. The query results can be accessed by using the $data variable in the template.

Summary

This article mainly introduces the concept and application of ThinkPHP encapsulation methods, among which functions and class methods are commonly used encapsulation forms. Customized encapsulation methods are one of the keys to improving code reusability and development efficiency. Developers should master and apply more encapsulation methods.

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