¿Cuáles son los componentes de yii?

What are yii components?

Yii applications are built upon components which are objects written to a specification. A component is an instance of CComponent or its derived class. Using a component mainly involves accessing its properties and raising/handling its events. The base class CComponent specifies how to define properties and events.

Behaviors are instances of yii/base/Behavior, or of a child class. Behaviors, also known as mixins, allow you to enhance the functionality of an existing component class without needing to change the class’s inheritance.

Yii is a full-stack framework providing many proven and ready-to-use features: query builders and ActiveRecord for both relational and NoSQL databases; RESTful API development support; multi-tier caching support; and more. Yii is extremely extensible. You can customize or replace nearly every piece of the core’s code.

Events allow you to inject custom code into existing code at certain execution points. You can attach custom code to an event so that when the event is triggered, the code gets executed automatically. For example, a mailer object may trigger a messageSent event when it successfully sends a message.

Applications are objects that govern the overall structure and lifecycle of Yii application systems. Each Yii application system contains a single application object which is created in the entry script and is globally accessible through the expression /Yii::$app .

For example, the request component is used to collect information about a user request and resolve it into a route; the db component represents a database connection through which you can perform database queries.

Components are the main building blocks of Yii applications….The yii/base/BaseObject class enforces the following object lifecycle:

• Pre-initialization within the constructor. You can set default property values here.
• Object configuration via $config .
• Post-initialization within init().
• Object method calls.

Yii is a high-performance, component-based PHP framework for developing large-scale Web applications rapidly. It enables maximum reusability in Web programming and can significantly accelerate your Web application development process.

Created by Qiang Xue in 2008, Yii is a secure, fast, high-performance application/web-development framework. Yii also is the fastest PHP framework, thanks to the lazy loading technique. Another great feature of Yii is jQuery integration.

Each URL rule consists of a pattern used for matching the path info part of URLs, a route, and a few query parameters. A URL rule can be used to parse a request if its pattern matches the requested URL. A URL rule can be used to create a URL if its route and query parameter names match those that are given.

Yii – URL Routing

• Step 1 − Modify the config/web.
• Step 2 − Got to http://localhost:8080/index.php.
• Step 3 − Add the following function to the SiteController.
• Step 4 − Then, modify the config/web.
• Step 5 − Now enter any URL of your application, you will see the following.

Behaviors are instances of the yii//base//Behavior class. A behavior injects its methods and properties to the component it is attached to. Behaviors can also respond to the events triggered by the component. Step 1 − To define a behavior, extend the yii//base//Behavior class.

Note that property prop2 is defined via the getter getProp2 () and the setter setProp2 (). This is the case because yii//base//Behavior extends yii//base//BaseObject and therefore supports defining properties via getters and setters.

Attaching a behavior to a component “injects” the behavior’s methods and properties into the component, making those methods and properties accessible as if they were defined in the component class itself.