If you want to destroy a single session variable then you can use unset() function to unset a session variable. If you want to destroy all the session variables, then use the following PHP function. The session is still on the users computer. It will create a new session and generate a unique session ID for the user. It does not unset any of the global variables associated with the session, or unset the session cookie. The PHP code in the example below simply starts a new session. 1. unset() destroys the specified variables. To begin a new session, simply call the PHP session_start() function. How to destroy a Session. From php.net: session_destroy() destroys all of the data associated with the current session. The session_destroy function deletes everything that’s stored in the current session. play_arrow. This function does not need any argument and a single call can destroy all the session variables. http://www.php.net/manual/en/ref.session.php Before you can store any information in session variables, you must first start up the session. If a globalized variable is unset() inside of a function, only the local variable is destroyed. You may need to destroy specific variables, which purpose has been accomplished or destroy a session completely in an explicit way. Destroying a PHP Session. The behavior of unset() inside of a function can vary depending on what type of variable you are attempting to destroy.. session_destroy(); If you want to clear or free up the space occupied by session variables for other use, the following PHP function is used. The Famous session_destroy – Remove Sessions From Disk. Because it's quite useful for functionality of force an user offline. Note: If it’s desired to kill the session, also delete the session cookie. The variable in the calling environment will retain the same value as before unset() was called. By "destroy a specific session" you mean "destroy one session variable"? There is an example in the online docs. edit close. Starting a PHP Session. link brightness_4 code You have visited this page 1in this session. Since all variables destroyed so PHP go to else condition output ‘session is destroyed’. session_unset just remove all session variables. On the other hand, if you want to delete all session-related data at once, you can use the session_destroy function. Syntax of destroying specific session variables The difference between both session_unset and session_destroy is as follows: session_unset just clears out the session for usage. A PHP session can be destroyed by session_destroy() function. Please feel free to post any easier way to destroy a particular session. Output: The execution of session.php file you can see that there is a different session ID it means the previous session has been destroyed and all variables and cookies also destroyed. This tutorial I will help you to easily selected user data from MySQL database using session variable in PHP in where clause.I will give the many examples and steps in this tutorial and follow the examples.. First connect the database in your web page and then start the session, that’s like session_start().Now select data from database using this code $_SESSION[‘user_id’]. session_unset(); Program 2: filter_none. It took me a while to figure out how to destroy a particular session in php. Though PHP automatically destroys a session after the timeout or a user has left the website. Note that by using session_unset, the variable still exists. session_destroy does not change any of the variables in your script execution, it removes the session data from the server. 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