Yii is a high-performance framework intended for the scalable, highly modular development of any website or application, regardless of size. It is an open-source product, meaning that it can be used free of charge, and is, therefore, highly suitable for creating attractive, extensible, and responsive designs that are highly regarded by companies in many countries.
Yii was originally intended to serve as an improved version of the PRADO framework that would be able to overcome issues such as slow speed when working with complex pages, a steep learning curve and limited possibilities for customisation. It was first released in 2006 as an alpha version, followed by the production-ready version 1.0 in the last month of 2008. In 2013, version 2.0 was released. It had an improved architecture and was based on and able to capitalise on the latest versions of PHP.
Yii is currently a very popular choice for the development of large-scale traffic- and computation-intensive projects because it covers many important aspects of rapid software development, including the following:
- Designed according to MVC principles.
- Can generate complex WSDL service specifications and manage Web service request handling.
- Support for translations and localisation
- Extensive caching support
- Highly capable, configurable, and manageable logging and error handling
- Built-in security measures to simplify protection against common vulnerabilities like CSRF, XSS, cookie tampering, and SQL injection
- Rapid code generation using a custom tool named Gii
- Full compliance with the XHTML standard
- Designed for compatibility with 3rd-party frameworks.