Phpsession use detailed instance code

Session_start (): enable the session mechanism. call session_register (): register the session variable session_unregister () at the beginning of the program file that requires the session ():

Session_start (): Enables the session mechanism and calls it at the very beginning of the program file that requires the session.

Session_register (): registers the session variable.

Session_unregister (): deletes session variables one by one)

Session_is_registered (): determines whether the session variable is registered.

Session_distroy (): destroys all session variables (destroys all session variables)

Initialize session, instance 1:

1. Session_start ();
2. // Delete all session variable values
3. $ _ Session = array ();
4. If (isset ($ _ cookie [session_name ()])
5. {
6. Setcookie (session_name (), '', time ()-42000 ,'/');
7. }
8. // Cancel all sessions
9. Session_destroy ();

Instance 2

1. Session_start (); // initialize the session
2. $ A = 5; // define the variable
3. Session_register ('A'); // register the session
4. Session_decode (" "); // Decrypt the string
5. Print (session_is_registered ('A ')? $ _ Session [a]: 'Not registered'); // determines whether the variable is registered.

Instance 3

1. /* Initialize the session */
2. Session_start ();
3. $ _ Session ['login _ OK '] = true; // defines the session value.
4. $ _ Session ['nome'] = 'sica '; // defines the session value.
5. $ _ Session ['inteiro '] = 34; // defines the session value.
6. $ Result = session_encode (); // encrypt the session value
7. Echo $ result; // output result
8. Session_destroy (); // deregister all session values

Instance 4

1. Session_start (); // initialize the session
2. $ _ Session ['name'] = "yoursession"; // register a session variable
3. If (! Isset ($ _ session ['initiation']) // if a value is not set
4. {
5. Session_regenerate_id (); // Obtain the current session id
6. $ _ Session ['initiation'] = true; // The set value is true.
7. }
8. Session_destroy (); // cancel the session

Instance 5

1. Session_start (); // initialize the session
2. $ _ Session ['name'] = "yoursession"; // register a session variable
3. If (session_is_registered (name) // judge
4. {
5. Echo "the specified variable has been registered as a session
   "; // Output Content
6. }
7. Else
8. {
9. Echo "the specified variable is not registered as a session
   "; // Output the corresponding result
10. }
11. Session_destroy (); // cancel the session