How to use CI5 framework in php?

With the continuous development of web development technology, using frameworks has become one of the daily tasks of modern developers. Among them, the CI framework has received widespread attention because of its simplicity and ease of use. This article will introduce readers to the use of the CI5 framework and how to use it flexibly in PHP development.

1. What is the CI5 framework

CI5 framework (CodeIgniter5) is a Web application framework based on the MVC design pattern and is developed using PHP language. The main goal of the CI5 framework is to develop web applications quickly while maintaining a flexible structure. Its own code size is small and it is very popular among web developers.

The CI5 framework provides a lot of reusable code to simplify the execution of common tasks. For example, it provides a lightweight template engine for generating interfaces during the development process; it also provides commonly used libraries and auxiliary functions for reuse in different applications.

2. Directory structure of the CI5 framework

When using the CI5 framework, we need to understand its directory structure in order to better develop and maintain our code. The directory structure of the CI5 framework is as follows:

application/
--config/
-----config.php
--controllers/
-----Welcome. php
--models/
-----User_model.php
--views/
-----welcome_message.php
system/
--core/
-----Controller.php
--libraries/
-----Database.php
--helpers/
-----Url_helper.php
- -third_party/
index.php
.htaccess

Among them, the application directory is our main development directory, including our code, configuration and templates. The system directory contains the system files of the CI5 framework. index.php is the entry file of the program, and the .htaccess file is used for URL rewriting. Taking the controllers directory as an example, we can see the code of the Welcome.php controller:

defined('BASEPATH') OR exit('No direct script access allowed');

class Welcome extends CI_Controller {
public function index()
{

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}
}

Here, we define a function named Welcome Controller, which inherits the CI_Controller class.

3. Use the CI5 framework

1. Load the view

Using the CI5 framework, we can use the view file provided by the framework, or we can write it ourselves view file. Suppose we write a view file called welcome_message.php, we can load it using:

$this->load->view('welcome_message');

Here, we use the load function to load the view, and the view file name (without the .php extension) as a parameter. The $this keyword refers to our controller class, and load is a function in the CI5 framework for loading views.

2. Getting POST data

In web applications, getting POST data is extremely common. In the CI5 framework, you can use the following method to obtain POST data:

$username = $this->input->post('username');
$password = $this->input ->post('password');

Here we use the post method of the input class. $username and $password are the POST data we obtained.

3. Loading library

CI5 framework provides many useful libraries, such as database libraries, cache libraries, etc. Using the CI5 framework, we can easily load these libraries:

$this->load->database();

Here we use the load function to load the database library. We can set up the database in a coherent way:

$this->db->where('name', 'John');
$query = $this->db-> get('users');

Here we set the where condition: the name field is equal to John. Then we use the get function to obtain all rows of the users table that meet the conditions.

4. Loading auxiliary functions

Auxiliary functions are a collection of many public classes, encapsulated in the form of functions. Using the CI5 framework, we can easily load these functions:

$this->load->helper('url');

Here we use the load function to load the URL helper function so that we can use the URL more conveniently in the program.

5. Set configuration items

CI5 framework uses configuration files to set different options. By reading the configuration file we can get or change these options.

$config['base_url'] = 'http://example.com/';
$this->config->set_item('base_url', $config['base_url'] );

Here we set the base URL and then call the set_item function with it as a parameter. We can also use the function to get the configuration:

$base_url = $this->config->item('base_url');

Here we use the item function to get the base_url in the config array options.

4. Summary

This article introduces the basic knowledge and usage of the CI5 framework. It is a lightweight framework that is easy to learn and use, but also provides many powerful features. If you want to learn more about the CI5 framework, you can refer to the official documentation or find relevant resources in the community. Using the CI5 framework allows us to develop web applications more efficiently and improve the readability and maintainability of the code.

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