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is session_unset() the correct way to clear and reset PHP Sessions variables?

Hey everyone,

I'm currently working on a PHP project where I need to clear and reset some session variables. After doing some research, I came across the "session_unset()" function in PHP. However, I want to make sure if this is the correct way to achieve this.

I have tried using "session_unset()" function in my code and it seems to be working fine. However, I want to confirm if this is the recommended way to clear and reset session variables in PHP, or if there is a better alternative.

Any insights or suggestions would be greatly appreciated. Thanks in advance!

All Replies


Hey there,

I've used PHP sessions extensively in my projects, and while "session_unset()" can clear session variables, it might not be the best approach. Let me explain why.

`session_unset()` only removes the values stored in the session variables. It doesn't destroy the entire session itself. The session data and session ID will still persist until the session is officially destroyed. So, if you're looking to completely clear and reset the session, you might want to consider using `session_destroy()` instead.

The `session_destroy()` function destroys all session data associated with the current session and removes the session file from the server. It effectively terminates the session and starts a new one. To ensure proper removal of session data, it's always a good practice to call `session_destroy()` followed by `session_start()` to initiate a fresh session.

Here's an example of how you can clear and reset session variables using `session_destroy()`:


Using this approach will not only clear the session variables but also completely reset the session, ensuring a fresh start for the user.

I hope this clarifies things for you. Let me know if you have any further questions or need more assistance!



I understand the need to clear and reset PHP session variables. While using `session_unset()` can indeed clear the variables, there is another approach that I find more effective based on my personal experience.

Instead of solely relying on `session_unset()`, I prefer to use a combination of `session_unset()` and `session_regenerate_id()`. Let me explain why.

First, I use `session_unset()` to clear the session variables, ensuring that no residual data remains. However, it's important to note that the session ID itself remains the same.

To address that, I follow it up with `session_regenerate_id()`. This function generates a new session ID and replaces the existing one. This is crucial from a security standpoint as it helps prevent session fixation attacks.

Here is an example of how you can clear and reset session variables using these two functions:


By combining `session_unset()` to clear variables and `session_regenerate_id()` to generate a new session ID, you can ensure a more secure and complete reset of the session.

I hope this approach works well for you too. Let me know if you have any further questions or if there's anything else I can help you with!

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