Warning: session_destroy () [function. session-destroy]: Tryin

When session_destroy () is used to cancel the Session variable

Warning: session_destroy () [function. session-destroy]: Trying to destroy
Uninitialized session in

Error !! It has been verified that the session_destroy () function must be called before use.
The following code is required:
<?
Session_start ();
Session_destroy ();
?>

Analysis

Lack of experience and insufficient understanding of sessions. This error occurs, and I checked it later,

Before calling session_destroy (), you must call session_start ();

To tell the system that you currently have a session. And then close it.