K.SWETHA. CSE-IV-A 08Q61A0556.

 INTRODUCTION  HISTORY  WORKING PROCESS  TECHNOLOGIES  ADVANTAGES AND DISADVANTAGES  CONCLUSION

 Yii is a high-performance component-based PHP framework for developing large- scale Webapplications. It enables maximum reusability in Web programming and can significantly accelerate the development process. The Yii framework is free software. It is released under the terms of the BSD License.  Yii (Yes it is) :-It is a PHP framework based on Object oriented php5.Developed by Qiang Xue.who started to work on YII on 1st January 2008.Qiang Xue was with experience in development of frameworks PRADO one of famous framework for PHP was also developed by Qiang Xue.  It is said that YII framework is best because it is based on DRY(Don't repeat yourself)design pattern that is why is is called fast application development framework.

 Like most PHP frameworks, Yii is an MVC framework. Yii excels over other PHP frameworks in that it is e ffi cient, feature-rich and clearly-documented.  Yii is carefully designed from the beginning to fit for serious Web application development.  It is the result of Web application development and the investigation and reflection of the most popular Web programming frameworks and applications.  To run an Yii-powered Web application, you need a Web server supporting PHP or higher. For developers who want to use Yii, understanding object- oriented programming (OOP)is very helpful, because Yii is a pure OOP framework.

The Yii project started on January 1, 2008, in order to fix some drawbacks of the PRADO framework. For example, PRADO was slow when handling complex pages, had a steep learning curve and many controls were difficult to customize, while Yii is much easier and more efficient. In October 2008 after ten months of private development, the first alpha version of Yii was released. On December 3, 2008, Yii 1.0 was formally released.  The Yii framework is free software. It is released under the terms of the following BSD License.  New Features This page summarizes the main new features introduced in each Yii release.  Version  Added support for displaying call stack information in trace messages ◦ Logging Context Information  Added index option to AR relations so that related objects can be indexed using the values of a specific column ◦ Relational Query Options

 Added index option to AR relations so that related objects can be indexed using the values of a specific column ◦ Relational Query Options  Version  Added support for using named scope with update and delete methods: ◦ Named Scopes  Added support for profiling SQL executions ◦ Profiling SQL Executions

 Added support for customizing a single URL rule by setting its urlFormat and case Sensitive options: ◦ User-friendly URLs  Added support for using a controller action to display application errors: ◦ Handling Errors Using an Action  Version Enhanced active record by supporting named scopes. See: ◦ Named Scopes

◦ Default Named Scope ◦ Relational Query with Named Scopes  Enhanced active record by supporting lazy loading with dynamic query options. See: ◦ Dynamic Relational Query Options  Enhanced CUrlManager to support parameterizing the route part in URL rules. See: ◦ Parameterizing Routes in URL Rules.

Yii implements the model-view-controller (MVC) design pattern which is widely adopted inWeb programming.  MVC aims to separate business logic from user interface considerations so that developers can more easily change each part without a ff ecting the other. In MVC, the model represents the information (the data) and the business rules; the view contains elements of the user interface such as text, form inputs; and the controller manages the communication between the model and the view.  Besides MVC, Yii also introduces a front-controller, called application, which represents the execution context of request processing. Application resolves the user request and dispatches it to an appropriate controller for further handling.

MODEL-VIEW-CONTROLLER  It is a software architecture,currently considered an architectural pattern used in software engineering.  Model View Controller (MVC) pattern creates applications that separate the different aspects of the application (input logic, business logic, and UI logic), while providing a loose coupling between these elements.

MODEL:- A model is an instance of its child class. Models are used to keep data and their relevant business rules. A model represents a single data object. It could be a row in a database table or a form of user inputs. VIEW:- A view is a PHP script consisting of mainly elements of user interface the spirit of seperation of logic and presentation, large chunk of logic should be placed in controller or model instead of view.  view has a name which is used to identify the view script file.

CONTROLLER:- This controller pattern creates applications that separate the different aspects of the application (input logic, business logic, and UI logic), while providing a loose coupling between these elements. Installation  Installation of Yii mainly involves the following two steps:  Download Yii Framework from yiiframework.com.  After installing Yii, you may want to verify that your server satisfies all the requirements of using Yii.

 YII built with help of :- Qiang Xue made use of several other web technologies to enhance the power of YII Qiang Xue used.  Ruby on Rails:-Yii inherits its spirit of convention over configuration. Yii also referenced its implementation of the active record design pattern for its ORM layer.  PRADO:-prado(framework) is major source in development of YII.  Jquery:-Jquery is integrated in yii.  Symphony and joomla :- were also used in development of yii. As mentioned above YII is young framework so developers are still working on it to make it more awesome But developers around the world started using it due to its great features and performance.

 Out of several frameworks few which are famous :-  CakePhp  Zend Framework  Symphony  Codeigniter  Prado. Yii-based projects:  1) web-based CRM application, the key feature of the project was building a custom framework above Yii 2) a web-portal for lawyers

 Google will display sitelinks for each language instead of probably mixed up stuff. In general, the whole SEO possibilities will be better.  The user experience will be better.  You can split your website into a real multi language portal.  It is very fast and efficient.

 If you use different subdomains for one site, the pagerank of your main domain (eg example.com) will probably suffer.  Google itself states that it's better to use top-level domains instead of subdomains.  For small multilanguage sites, I would suggest to just use english url rules with one main domain.

Yii does not need to be installed under a Web-accessible directory. An Yii application has one entry script which is usually the only file that needs to be exposed to Web users. Other PHP scripts, including those from Yii, should be protected from Web access since they may be exploited for hacking.

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