A controller is responsible for executing a sequence of instructions in response to some stimulus (maybe a command, action, or event). This tag is appropriate for questions pertaining to the controller of a Model-View-Controller pattern.

A controller is responsible for executing a sequence of instructions in response to some stimulus (maybe a command, action, or event). In Joomla!, this term is used to refer to the controller portion of the MVC (Model-View-Controller) pattern.

Joomla makes extensive use of the Model-View-Controller design pattern.

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