What are the common Yii framework operations in PHP programming?

Yii framework is an open source, high-performance Web application framework. It has the advantages of simplicity, ease of use, efficiency, stability, and support for multiple databases. Therefore, it has been widely used in PHP development. The following will introduce some common operations in the Yii framework.

1. Create Application

In the Yii framework, to create a new web application, just create an instance using the yiiwebApplication class. For example:

use yiiwebApplication;

$application = new Application([
    'id' => 'myapp',
    'basePath' => dirname(__DIR__),
]);

where id is the application ID and basePath is the root directory of the application.

2. Routing

Routing is a very important function in the Yii framework. It is responsible for converting URLs into corresponding controllers and operation methods. The Yii framework provides two routing methods:

• Rule-based routing

Rule-based routing is implemented by configuring routing rules in the configuration file. For example:

return [
    'components' => [
        'urlManager' => [
            'enablePrettyUrl' => true,
            'showScriptName' => false,
            'rules' => [
                'post/<id:d+>' => 'post/view',
                'posts' => 'post/index',
            ],
        ],
    ],
];

The above configuration indicates that post/1ae845aa4984539391bc1a58ac88f77f in the URL will be converted into the corresponding post/view operation method, and posts in the URL is converted into the corresponding post/index operation method.

• Dynamic routing

Dynamic routing is achieved by dynamically setting routes in code. For example:

use yiiwebUrlRule;

Yii::$app->urlManager->addRules([
    new UrlRule([
        'pattern' => 'post/<id:d+>',
        'route' => 'post/view',
    ]),
]);

The above code means converting post/1ae845aa4984539391bc1a58ac88f77f in the URL into the corresponding post/view operation method.

3. Database operation

In the Yii framework, you can perform database operations very conveniently. Yii supports a variety of databases, including MySQL, Oracle, SQLite, SQL Server, etc. . For example:

• Query data

use yiidbQuery;

$query = new Query();
$data = $query->select(['id', 'name', 'age'])
    ->from('user')
    ->where(['age' => 18])
    ->orderBy('name')
    ->all();

The above code indicates that users aged 18 are queried from the user table and sorted by name .

• Add data

$user = new User();
$user->name = '张三';
$user->age = 20;
$user->save();

The above code indicates that a record named Zhang San and age 20 is inserted into the user table.

4. Authentication and Authorization

In Web applications, user authentication and authorization are often required. Some components are provided in the Yii framework to help implement these functions.

• Authentication

use yiiwebUser;

$user = Yii::$app->user;
if ($user->isGuest) {
    // 用户未登录
} else {
    // 用户已登录
}

The above code indicates whether the current user has logged in.

• Authorization

use yiiwebAccessControl;

return [
    'as access' => [
        'class' => AccessControl::className(),
        'rules' => [
            [
                'actions' => ['login', 'error'],
                'allow' => true,
            ],
            [
                'actions' => ['logout', 'index'],
                'allow' => true,
                'roles' => ['@'],
            ],
        ],
    ],
];

The above code indicates that the logout and index operations are restricted to be accessed only by logged-in users.

Summary

The above are the more common operations in the Yii framework. The Yii framework has a very rich set of functions and components, which can greatly improve the development and operation efficiency of web applications. By mastering these common operations, developers can become more proficient in using the Yii framework for web application development.

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