what is yii2

Yii has two main versions: Yii1.1 and Yii2.0. Yii1.1 is an old version. At the time of writing this book, the latest version number is 1.1.15. Yii1.1 is no longer undergoing new development. The official is only performing maintenance and updating security vulnerabilities. No new features will be introduced.

And Yii2.0 is a framework that is completely overthrown and rewritten based on Yii1.1, absorbing many of the latest technologies and mainstream developments. Convention is the representative of the latest generation of web development frameworks. (Recommended learning: yii tutorial)

Uses new technologies and standards such as PHP namespace, Trait, PSR standard, Composer and Bower package manager.

Implemented new architecture and new models such as dependency injection, dependency injection container and service locator (Service Locator).

Yii2.0 attaches great importance to security and adopts a series of measures to effectively prevent SQL injection, XSS attacks, CSRF attacks, cookie tampering, etc.

It widely supports various SQL and NOSQL databases, efficiently implements Active Record and other database query and operation interfaces, and provides functions such as database migration, replication, and read-write separation.

A fully standards-compliant RESTful API can be implemented with a minimal amount of code.

Supports caching mechanisms of various granularities and media.

Provides a variety of authentication and authorization methods based on cookie and token-based authentication, RBAC and other permission control methods, and supports OpenID, OAuth1, OAuth2, etc.

Supports Bootstrap, jQuery UI, and provides a wealth of Widgets for use.

Complete international support, providing time, plural and other formatting tools that comply with ICU standards, as well as functions such as message translation and view translation.

In addition to supporting the two mainstream PHP template engines Twig and Smarty, developers can also write their own extensions to support other engines.

Provides efficient development tools such as Yii debugging toolbar, Gii code generator and document generator for hard-working coders.

Integrates Codeception and Faker, and combines with DB Migration to provide a fixture framework to facilitate test development.

Provides a simple application template and an advanced application template, which are suitable for different development scenarios and can help developers build their own applications as soon as possible.

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