About the Yii PHP Framework
Yii is an open-source, object-oriented PHP web application framework, ideal for creating complex web applications, website back-ends, or in the development of APIs.
Yii comes with very good support for Internationalisation and Localisation (I18N and L10N), making it easy to support multiple language translation, timezones and date and time formatting. We've used these I18N features to good effect on projects in the past, developing web-based applications that operate globally and in 14 languages.
Yii has strong security capabilities, with built-in support for prevention of cross-site scripting (XSS), cross-site request forgery (CSRF), together with secure implementations of PHP cryptographic libraries and hash methods for secure password and user credential handling.