Home > Article > Backend Development > How to use CI framework in PHP
PHP is a popular programming language widely used in web development. The CI (CodeIgniter) framework is one of the most popular frameworks in PHP. It provides a complete set of ready-made tools and function libraries, as well as some popular design patterns, allowing developers to develop Web applications more efficiently. This article will introduce the basic steps and methods of developing PHP applications using the CI framework.
Before using the CI framework, we need to understand some basic concepts and structures. The following are some basic components of the CI framework:
Controller (Controller): The controller is the core of the application. It is responsible for responding to user requests and processing data.
Model: A model is a component that interacts with the database and processes data and logic in the application.
View: View is a component that displays data and is generally responsible for handling user interaction and page layout.
Core: The core is the core component of the CI framework, including some basic functions and class libraries.
Helper: Helper is a component that provides auxiliary functions to simplify code.
Library: A library is a component of a custom class that can encapsulate commonly used code into a library for easy reuse.
Configuration: Configuration files are used to configure CI framework and application settings, such as database connections, URL routing, etc.
To use CI framework, we need to install it first. The CI framework can be downloaded from the official website or installed through Composer. After downloading, we need to place the CI framework in the web server directory and configure environment variables and file permissions.
After installing the CI framework, we can create a CI application. The CI framework provides a tool to quickly create applications. Just execute the following command in the terminal:
$ cd /path/to/ci/
$ php spark create project-name
Where, project-name is the name of the application. After executing the above command, the CI framework will automatically generate the basic structure and files of the application, such as controllers, models, views, and configuration files.
In the CI framework, the controller is the core component of the application, which responds to user requests and processes data. To create a controller, we need to create a new PHP file in the controllers directory under the application directory, name it example.php, and define the following code inside it:
4da633f38a9504d05c4764909afd9557
Where, Example is the name of the controller, index is the default method of the controller, when the user requests the controller , the method will be automatically called and the code in it will be executed.
Route (Route) defines the mapping relationship between URL and controller. Through routing, we can redirect the URL requested by the user to the specified controller method. In the CI framework, routing configuration is saved in the config/routes.php file in the application directory. To define a route, we need to add the following code to the file:
$route['example'] = 'example/index';
where example represents the URL to be redirected , example/index represents the controller and method to be called.
A view (View) is a component that displays data and is usually used to present data and interfaces. To create a view, we need to create a PHP file, such as example.php, in the views directory under the application directory, and define the following code in it:
100db36a723c770d327fc0aef2ce13b1
93f0f5c25f18dab9d176bd4f6de5d30e
<title>Example View</title>
9c3bca370b5104690d9ef395f2c5f8d1
6c04bd5ca3fcae76e30b72ad730ca86d
<h1><?php echo $title; ?></h1> <p><?php echo $content; ?></p>
36cc49f0c466276486e50c850b7e4956
73a6ac4ed44ffec12cee46588e518a5e
Among them, $title and $content is data obtained from the controller and can be output to the page using PHP code.
Model is a component that interacts with the database and is usually used to query and update the database. To load a model, add the following code in your controller:
a17577b6a9358c81460d3953fb360242
Among them, example_model is the name of the model to be loaded, and get_data is the method defined in the model for querying data.
After going through these steps, we can create a complete CI application. Application settings, selection of the appropriate database, etc. can be done through configuration files. The CI framework also provides some commonly used functions and class libraries, such as form validation, file upload, image processing, etc., which can help us complete application development more efficiently.
Summary
The CI framework is one of the most popular frameworks in PHP. It provides a complete set of ready-made tools and function libraries, as well as some popular design patterns, allowing developers to be more Develop web applications efficiently. This article introduces the basic steps and methods of developing PHP applications using the CI framework, including creating controllers, defining routes, loading models, and creating views. Using a CI framework can greatly simplify the development of PHP applications and improve development efficiency.
The above is the detailed content of How to use CI framework in PHP. For more information, please follow other related articles on the PHP Chinese website!