The Symfony\Component\HttpFoundation\Session\SessionInterface is an interface in PHP Symfony\Component\HttpFoundation\Session component. It defines the methods that should be implemented by any class that represents a session.
A session in web development refers to a way of storing data on the server-side to track user interaction across multiple requests. The SessionInterface provides methods to manage and manipulate session data, such as getting and setting session variables, checking if a variable exists, removing variables, and clearing the session.
By implementing this interface, different classes can provide their own implementation of how the session data is stored and accessed. This allows for flexibility and compatibility with various session storage systems, such as files, databases, or in-memory storage.
Using the SessionInterface ensures the code is decoupled from the specific session implementation details. This abstraction helps in writing testable and maintainable code, as well as easily switching between different session storage mechanisms without affecting other parts of the application.
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