mirror of
https://github.com/yiisoft/yii2.git
synced 2025-11-04 14:46:19 +08:00
61 lines
3.3 KiB
Markdown
61 lines
3.3 KiB
Markdown
What is Yii
|
|
===========
|
|
|
|
Yii is a high performance, component-based PHP framework for rapidly developing modern Web applications.
|
|
The name Yii (pronounced `Yee` or `[ji:]`) means "simple and evolutionary" in Chinese. It can also
|
|
be thought of as an acronym for **Yes It Is**!
|
|
|
|
|
|
What is Yii Best for?
|
|
---------------------
|
|
|
|
Yii is a generic Web programming framework, meaning that it can be used for developing all kinds
|
|
of Web applications using PHP. Because of its component-based architecture and sophisticated caching
|
|
support, it is especially suitable for developing large-scale applications such as portals, forums, content
|
|
management systems (CMS), e-commerce projects, RESTful Web services, and so on.
|
|
|
|
|
|
How does Yii Compare with Other Frameworks?
|
|
-------------------------------------------
|
|
|
|
If you're already familiar with another framework, you may appreciate knowing how Yii compares:
|
|
|
|
- Like most PHP frameworks, Yii implements the MVC (Model-View-Controller) architectural pattern and promotes code
|
|
organization based on that pattern.
|
|
- Yii takes the philosophy that code should be written in a simple yet elegant way. Yii will never try to
|
|
over-design things mainly for the purpose of strictly following some design pattern.
|
|
- 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. You can also
|
|
take advantage of Yii's solid extension architecture to use or develop redistributable extensions.
|
|
- High performance is always a primary goal of Yii.
|
|
|
|
Yii is not a one-man show, it is backed up by a [strong core developer team](https://www.yiiframework.com/team/), as well as a large community
|
|
of professionals constantly contributing to Yii's development. The Yii developer team
|
|
keeps a close eye on the latest Web development trends and on the best practices and features
|
|
found in other frameworks and projects. The most relevant best practices and features found elsewhere are regularly incorporated into the core framework and exposed
|
|
via simple and elegant interfaces.
|
|
|
|
|
|
Yii Versions
|
|
------------
|
|
|
|
Yii currently has two major versions available: 1.1 and 2.0. Version 1.1 is the old generation and is now in maintenance mode. Version 2.0 is a complete rewrite of Yii, adopting the latest
|
|
technologies and protocols, including Composer, PSR, namespaces, traits, and so forth. Version 2.0 represents the current
|
|
generation of the framework and will receive the main development efforts over the next few years.
|
|
This guide is mainly about version 2.0.
|
|
|
|
|
|
Requirements and Prerequisites
|
|
------------------------------
|
|
|
|
Yii 2.0 requires PHP 5.4.0 or above and runs best with the latest version of PHP. You can find more detailed
|
|
requirements for individual features by running the requirement checker included in every Yii release.
|
|
|
|
Using Yii requires basic knowledge of object-oriented programming (OOP), as Yii is a pure OOP-based framework.
|
|
Yii 2.0 also makes use of the latest features of PHP, such as [namespaces](https://www.php.net/manual/en/language.namespaces.php)
|
|
and [traits](https://www.php.net/manual/en/language.oop5.traits.php). Understanding these concepts will help
|
|
you more easily pick up Yii 2.0.
|
|
|