Yii is a high performance, component-based PHP framework for rapidly developing modern Web applications.
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
The name Yii (pronounced `Yee` or `[ji:]`) means "simple and evolutionary" in Chinese. It can also
be considered as the acronym for **Yes It Is**!
be thought of as an acronym for **Yes It Is**!
What is Yii Best for?
What is Yii Best for?
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organization based on this pattern.
organization based on this pattern.
- Yii takes the philosophy that code should be written in a simple yet elegant way. It will never try to
- Yii takes the philosophy that code should be written in a simple yet elegant way. It will never try to
over-design things mainly for the purpose of following some design pattern.
over-design things mainly for the purpose of following some design pattern.
- Yii is a full-stack framework providing many proven and ready-to-use features, such as query builders
- Yii is a full-stack framework providing many proven and ready-to-use features, such as: query builders
and ActiveRecord supporting relational and NoSQL databases, RESTful API development support, multi-tier
and ActiveRecord, for both relational and NoSQL databases; RESTful API development support; multi-tier
caching support, etc.
caching support; and more.
- Yii is extremely extensible. You can customize or replace nearly every piece of core code. You can also
- Yii is extremely extensible. You can customize or replace nearly every piece of core code. You can also
take advantage of its solid extension architecture, use or develop redistributable extensions.
take advantage of its solid extension architecture, to use or develop redistributable extensions.
- High performance is always a primary goal of Yii.
- 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][] as well as a large community
Yii is not a one-man show, it is backed up by a [strong core developer team][] as well as a large community
with many professionals who are constantly contributing to the development of Yii. The Yii developer team
with many professionals constantly contributing to the development of Yii. The Yii developer team
is keeping a close eye on the latest trends of Web development and the best practices and features
keeps a close eye on the latest trends of Web development, and on the best practices and features
found in other frameworks and projects. They are being carefully incorporated into the core framework and exposed
found in other frameworks and projects. The most relevant best practices and features found elsewhere are regularly incorporated into the core framework and exposed
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...
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Yii Versions
Yii Versions
------------
------------
Yii has two major versions available currently: 1.1 and 2.0. Version 1.1 is the old generation and is
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
currently under maintenance mode. Version 2.0 is a complete rewrite of Yii by adopting the latest
technologies and protocols, including Composer, PSR, namespaces, traits, and so forth. Version 2.0 represents the latest
technologies and protocols, such as Composer, PSR, namespaces, traits, etc. Version 2.0 represents the latest
generation of the framework and will receive our main development efforts in the next few years.
generation of the framework and will receive our main development efforts in the next few years.
This guide is mainly about version 2.0.
This guide is mainly about version 2.0.
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Requirements and Prerequisites
Requirements and Prerequisites
------------------------------
------------------------------
Yii 2.0 requires PHP 5.4.0 or above. You may find out more detailed requirements for individual features
Yii 2.0 requires PHP 5.4.0 or above. You can find more detailed requirements for individual features
by running the requirement checker included in every release.
by running the requirement checker included in every Yii release.
Using Yii requires basic knowledge about object-oriented programming (OOP), as Yii is a pure OOP-based framework.
Using Yii requires basic knowledge about 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](http://www.php.net/manual/en/language.namespaces.php),
Yii 2.0 also makes use of the latest features of PHP, such as [namespaces](http://www.php.net/manual/en/language.namespaces.php) and [traits](http://www.php.net/manual/en/language.oop5.traits.php). Understanding these concepts will help
[traits](http://www.php.net/manual/en/language.oop5.traits.php). Understanding these concepts will help
