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Application --> Module --> Action, which can satisfy a The needs of multiple applications under the project, and each layer can define its own class library, configuration file, layout; very powerful command line operation functions, including building projects, building applications, building modules, refreshing cache, etc.;
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PHP framework for developing large-scale web applications. Yii has almost all the features of , including MVC, DAO/ActiveRecord, I18N/L10N, caching, JQuery-based AJAX support, user authentication and role-based access control, scaffolding, input validation, components, events, theming, web services, and more. Yii is written in strict OOP. Yii is simple to use, very flexible, and has good scalability.