Auth::setLogoutCallback() -- set a callback for successful logout attempts
Description
     This function sets a callback function which is called upon successful
     logout of a user account.
    
     The callback function will be passed two parameters, the username that
     successfully logged out and a reference to the Auth object.
    
Parameter
     
- string
        $loginCallback
         
         the call back function to use
        
 
    Note
This function can not be called
statically.