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