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A component is an independent piece of code written for specific task that can be used by calling in controllers (example : email component), helper is used for helping cakePHP in rendering the data to be shown to user with views, these only adds to modularity in code otherwise same coding can be implemented in controller.
Cakephp is a rapid development framework for PHP that provides an extensible architecture for developing, maintaining, and deploying applications. it uses commonly known design patterns like MVC,ORM within the convention over configuration paradigm, It also reduces development costs and helps developers write less code.
The location of the $_SESSION variable storage is determined by PHP's session.save_path configuration. Usually this is /tmp on a Linux/Unix system. Use the phpinfo() function to view your particular settings if not 100% sure by creating a file with this content in the DocumentRoot of your domain.
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