How to use CI framework in php?

With the development of network technology, PHP has become one of the important tools for Web development. One of the popular PHP frameworks - CodeIgniter (hereinafter referred to as CI) has also received more and more attention and use. Today, we will take a look at how to use the CI framework.

1. Install the CI framework

First, we need to download the CI framework and install it. Download the latest version of the CI framework compressed package from CI's official website (https://codeigniter.com/). After the download is complete, unzip it to your web server directory. For convenience, we take WampServer as an example, unzip the CI framework to the C:wamp64www directory, and rename it to "ci".

2. Configure the CI framework

The default configuration file of the CI framework is application/config/config.php. We can configure some common options here, for example:

1. Set the default controller and default method:

$config['default_controller'] = 'welcome';
$ config['default_method'] = 'index';

2. Set time zone:

$config['timezone'] = 'Asia/Shanghai';

3. Set the error display level:

$config['log_threshold'] = 1;
$config['display_errors'] = TRUE;

4. Set database connection information:

$db['default'] = array(

'dsn'    => '',
'hostname' => 'localhost',
'username' => 'root',
'password' => '',
'database' => 'test',
'dbdriver' => 'mysqli',
'dbprefix' => '',
'pconnect' => FALSE,
'db_debug' => (ENVIRONMENT !== 'production'),
'cache_on' => FALSE,
'cachedir' => '',
'char_set' => 'utf8',
'dbcollat' => 'utf8_general_ci',
'swap_pre' => '',
'encrypt' => FALSE,
'compress' => FALSE,
'stricton' => FALSE,
'failover' => array(),
'save_queries' => TRUE

);

3. Create a CI controller

The controller of the CI framework is located in the application/controllers directory Down. We can create custom controllers by inheriting the CI_Controller class. For example, create a new file called Welcome.php in the application/controllers directory:

class Welcome extends CI_Controller {

public function index() {
    echo "Hello, world!";
}

}

This The controller has only one index method. When we visit http://localhost/ci/index.php/welcome, "Hello, world!" will be output.

4. Create CI model

The model of the CI framework is located in the application/models directory. We can create custom models by inheriting the CI_Model class. For example, create a new file called Test_model.php in the application/models directory:

class Test_model extends CI_Model {

public function get_data() {
    // 从数据库中获取数据
}

}

This The model has only one get_data method, which can be used to get data from the database.

5. Create a CI view

The view of the CI framework is located in the application/views directory. We can create custom views by creating PHP files. For example, create a new file called test.php in the application/views directory:

<meta charset="UTF-8">
<title><?=$title?></title>

<h1><?=$content?></h1>

This view contains two variables $title and $content, Data can be passed to them through the controller.

6. Use of controllers and models

When we need to use the model in the controller, we can load it through the following statement:

$this-> load->model('test_model');

Then you can call it in the controller:

$data = $this->test_model->get_data();

And when we need to output variables in the view, we can pass them to the view in the controller:

$this->load->view('test', array ('title' => 'Test', 'content' => 'Hello, world!'));

7. Summary

CI framework is a small but powerful PHP framework, its simplicity and ease of use make it the first choice for developers. This article introduces the installation, configuration and common functions of the CI framework. I believe it has certain reference value for beginners. Of course, we have only briefly introduced how to use the CI framework. If you want to understand its principles and more features in depth, you need to study it yourself.

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