Backend Development
PHP Tutorial
CodeIgniter introductory tutorial Part 1: Information release, ci_PHP tutorial
CodeIgniter introductory tutorial Part 1: Information release, ci_PHP tutorial
CodeIgniter introductory tutorial part one: information release, ci
1. MVC
CodeIgniter adopts the MVC architecture: control layer, model layer and view layer.
Corresponds to the folder under Application (Figure 1):
All new files end with .php
Place the view layer view folder into the HTML template
The model layer model stores the code for database operations
The control layer controllers stores the code for logical judgment. It obtains data from the model layer and then inputs it to the view layer and sends it to the user.
Figure 1
Function:
1. Template adds input form
2. The controller adds code to receive form data and perform 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 database
Modify 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 adopts a single file entry method, and the control layer must be accessed through index.php by default. 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
3. Output page
1. Directly output 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 your 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" id="" 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" id="" cols="30" rows="10"></textarea>
<br>
<input type="submit" value="提交" >
</form>
</body>
Refresh to see the effect:
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
1669
14
1428
52
1329
25
1273
29
1256
24
How to use bootstrap in vue
Apr 07, 2025 pm 11:33 PM
Using Bootstrap in Vue.js is divided into five steps: Install Bootstrap. Import Bootstrap in main.js. Use the Bootstrap component directly in the template. Optional: Custom style. Optional: Use plug-ins.
How to get the bootstrap search bar
Apr 07, 2025 pm 03:33 PM
How to use Bootstrap to get the value of the search bar: Determines the ID or name of the search bar. Use JavaScript to get DOM elements. Gets the value of the element. Perform the required actions.
How to do vertical centering of bootstrap
Apr 07, 2025 pm 03:21 PM
Use Bootstrap to implement vertical centering: flexbox method: Use the d-flex, justify-content-center, and align-items-center classes to place elements in the flexbox container. align-items-center class method: For browsers that do not support flexbox, use the align-items-center class, provided that the parent element has a defined height.
How to insert pictures on bootstrap
Apr 07, 2025 pm 03:30 PM
There are several ways to insert images in Bootstrap: insert images directly, using the HTML img tag. With the Bootstrap image component, you can provide responsive images and more styles. Set the image size, use the img-fluid class to make the image adaptable. Set the border, using the img-bordered class. Set the rounded corners and use the img-rounded class. Set the shadow, use the shadow class. Resize and position the image, using CSS style. Using the background image, use the background-image CSS property.
How to write split lines on bootstrap
Apr 07, 2025 pm 03:12 PM
There are two ways to create a Bootstrap split line: using the tag, which creates a horizontal split line. Use the CSS border property to create custom style split lines.
How to set up the framework for bootstrap
Apr 07, 2025 pm 03:27 PM
To set up the Bootstrap framework, you need to follow these steps: 1. Reference the Bootstrap file via CDN; 2. Download and host the file on your own server; 3. Include the Bootstrap file in HTML; 4. Compile Sass/Less as needed; 5. Import a custom file (optional). Once setup is complete, you can use Bootstrap's grid systems, components, and styles to create responsive websites and applications.
How to resize bootstrap
Apr 07, 2025 pm 03:18 PM
To adjust the size of elements in Bootstrap, you can use the dimension class, which includes: adjusting width: .col-, .w-, .mw-adjust height: .h-, .min-h-, .max-h-
How to use bootstrap button
Apr 07, 2025 pm 03:09 PM
How to use the Bootstrap button? Introduce Bootstrap CSS to create button elements and add Bootstrap button class to add button text
