CodeIgniter introductory tutorial Part 1: Information release
1. MVC
CodeIgniter adopts the MVC architecture: control layer, model layer and view layer.
Corresponding to the folder under Application (Figure 1):
All new files end with .php
The view layer view folder is placed into the HTML template
The model layer model stores the code for database operations
The control layer controllers store The code for logical judgment obtains data from the model layer and then inputs it to the view layer and sends it to the user.
Figure 1
Function:
1. The template adds an input form
2. The controller adds code for receiving form data and performs simple verification of user input.
3. Output the title, text, and release time above the form.
Knowledge points used: CI helper class (url) and input class (input),
and CI ActiveRecord and passing values to templates.
2. Initial configuration
1. Link to the database
Modify the database configuration: /application/config/database.php
'hostname' => 'localhost',
'username' => 'root',
'password' => '',
'database' => 'test',
'dbdriver' => 'mysqli',
'dbprefix' => 'ts_',
2. Modify the default route
The CI framework uses a single file entry method, which must be passed by default index.php to access the control layer. For example, there is a class named test under the controllers folder, and test has a function called home.
The access URL is: http://www.example.com/index.php/test/home
Three. Output page
1. Directly output the HTML template
Create two new files located in the controllers folder and views folder
Test.php
<?php
defined('BASEPATH') OR exit('No direct script access allowed');
class Test extends CI_Controller {
public function home()
{
$this->load->view('home');
}
}
home.php
<?php defined('BASEPATH') OR exit('No direct script access allowed'); ?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Home</title>
</head>
<body>
<h1>这是我们的主页</h1>
</body>
</html>
Open an address similar to the following in the browser: http:// test.com/index.php/test/home
2. Insert database entry
Create database table ts_news
Test.php
<?php
defined('BASEPATH') OR exit('No direct script access allowed');
class Test extends CI_Controller {
public function __construct()
{
parent::__construct();
$this->load->helper('url');
$this->load->model('news_model');
}
public function home()
{
$this->load->view('home');
}
public function add_news(){
$title = $this->input->get('title',TRUE);
$content = $this->input->get('content');
if ( (strlen($title) < 20 ) or (strlen($content) < 20 ) ){
echo '标题或正文内容过短';
return false;
}
$arr = array(
'id' => '',
'title' => $title,
'content' => $content,
'update_time' => time(),
'create_time' => time()
);
$check = $this->news_model->insert($arr,'news');
if ($check)
{
redirect('test/home');
}
else
{
echo '提交失败';
}
}
}
home.php
<?php defined('BASEPATH') OR exit('No direct script access allowed'); ?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Home</title>
</head>
<body>
<h1>这是我们的主页</h1>
<hr>
<form action="<?php echo site_url('test/add_news'); ?>">
<label for="title">标题</label>
<input type="text" name="title" value="">
<br>
<label for="content">正文</label>
<textarea name="content" cols="30" rows="10"></textarea>
<br>
<input type="submit" value="提交" >
</form>
</body>
</html>
News_model.php
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class News_model extends CI_Model {
public function __construct()
{
parent::__construct();
$this->load->database();
}
public function insert($arr,$table)
{
$this->db->insert($table, $arr);
if ($this->db->affected_rows() > 0)
{
return $this->db->insert_id();
}
else
{
return FALSE;
}
}
}
412ded80-4884-4a2f-ae37-6ba69cdc4278
493498ee-0f5c-4676-9cec-38e5a3f3e6fd
3. 查询数据库并输出
News_model.php增加
public function get_all($table)
{
$this->db->select('*');
$query = $this->db->get($table);
$query = $query->result_array();
return $query;
}
Test.php 的 home修改为:
public function home()
{
$news = $this->news_model->get_all('news');
$data['news'] = $news;
$this->load->view('home',$data);
}
The body of the Home template is modified to:
<body>
<h1>这是我们的主页</h1>
<?php
foreach ($news as $key => $value) {
echo '<div>
<h3>'.$value['title'].'</h3>
<span>发布时间：'.date('Y-m-d H:i:s',$value['create_time']).'</span>
<p>'.$value['content'].'</p>
</div>';
}
?>
<hr>
<form action="<?php echo site_url('test/add_news'); ?>">
<label for="title">标题</label>
<input type="text" name="title" value="">
<br>
<label for="content">正文</label>
<textarea name="content" cols="30" rows="10"></textarea>
<br>
<input type="submit" value="提交" >
</form>
</body>
Refresh to view the effect:
The above introduces the first part of the CodeIgniter introductory tutorial: Information Release, including aspects of the content. I hope it will be helpful to friends who are interested in PHP tutorials.
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian
Dec 24, 2024 pm 04:42 PM
PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati
How To Set Up Visual Studio Code (VS Code) for PHP Development
Dec 20, 2024 am 11:31 AM
Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c
Explain JSON Web Tokens (JWT) and their use case in PHP APIs.
Apr 05, 2025 am 12:04 AM
JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,
How do you parse and process HTML/XML in PHP?
Feb 07, 2025 am 11:57 AM
This tutorial demonstrates how to efficiently process XML documents using PHP. XML (eXtensible Markup Language) is a versatile text-based markup language designed for both human readability and machine parsing. It's commonly used for data storage an
Explain late static binding in PHP (static::).
Apr 03, 2025 am 12:04 AM
Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.
PHP Program to Count Vowels in a String
Feb 07, 2025 pm 12:12 PM
A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total
What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases?
Apr 03, 2025 am 12:03 AM
What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.
PHP and Python: Comparing Two Popular Programming Languages
Apr 14, 2025 am 12:13 AM
PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.
