How to delete session array in php

In PHP, session (Session) is a mechanism used to create a persistent connection between the user and the application. It is similar to a cookie, but differs from a cookie in that it stores data on the server rather than on the client. Sessions are usually used to store user login information, user browsing history, shopping cart information, etc.

Session in PHP is implemented through session array (Session Array). The session array is an associative array whose keys and values ​​are of type string. Its keys are user-defined, and the values ​​can be any type of data, such as strings, numeric values, arrays, etc. In PHP, there are two ways to delete the session array, one is to delete the value of the specified key, the other is to delete the entire session array.

1. Delete the value of the specified key

To delete the value of the specified key, you can use the unset() function. For example, the following code deletes the key named "cart" in the session array $_SESSION:

unset($_SESSION['cart']);

After executing the unset() function, the key named "cart" will be deleted from the $_SESSION array. If the key does not exist, no action will be taken.

2. Delete the entire session array

To delete the entire session array, you can use the session_destroy() function. The following is a sample code:

session_destroy();

After executing the session_destroy() function, all keys and values ​​in the session array $_SESSION will be deleted. It should be noted that this function will only delete the session array, but will not delete the session files saved on the server. If you want to completely clear the session data, you also need to use the session_unset() function to clear the session data and session files on the server.

Summary

In PHP, the session array is a common data storage method, used to save the user's login information, shopping cart information, etc. To delete values ​​in the session array, you can use the unset() function, and to delete the entire session array, you can use the session_destroy() function. When using session arrays, you need to pay attention to data security issues to avoid leakage of sensitive data.

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