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When are the frameworks used in PHP or any other language used?

When there is a need to use frameworks in PHP. I heard about the structure of zend and symfony. I read about them, but still do not understand what exactly we use the software development framework.

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The framework often provides you with the boiler plate code, which you will have to use otherwise, for example: Session management, Templating, access to the database, etc. etc.

From the point of view of proper software development, the use of these frameworks, as a rule, contributes to the correct design with such templates as MVC (Model, View, Controller). Using this template, you can increase code reuse, worry separation , etc.

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Thus, the naming convention for classes and objects and structures, the structure of files and directories, the location of third-party code, the template system, localization / internationalization, etc. a well-designed (and mature) structure will be well defined and accessible through third-party or community documentation.

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