system/libary/session.php
/**
     * Delete session
     *
     * @param string nullable $storage
     * @return void
     */
Delete session
@param string nullable $storage
@return void
Delete session @param string nullable $storage @return void
public function delete($storage = null)
    {
        if (is_null($storage))
            session_unset();
        else
            unset($_SESSION[$storage]);
    }
public function delete ( $ storage = null ) { if ( is_null ( $ storage ) ) session_unset ( ) ; else unset ( $ _SESSION [ $ storage ] ) ; }
Delete session
 @param string nullable $storage
 @return void
Delete session @param string nullable $storage @return void