可以覆盖超级全局$ _SESSION吗？

class SessionObject implements ArrayAccess { ... }

...

// Session data has just been deserialised from store.
$_SESSION = new SessionObject( $session_data );

...

// Using session object...
$_SESSION[\'key\'] = 27;
$x = $_SESSION->get_data(\'key2\', \'default-value\');

$_SESSION

class Session {
    public function get($key, $defaultValue = null) {
        // do some code to get the value for $key, and return $defaultValue if there is none
    }

    public function set($key, $value) {
        // do some code to set $key
    }
}

Session::get(\'someKey\')

Session::get(\'someKey\', \'default\')

Session::set(\'someKey\', \'someValue\')

register_shutdown_function(function(){
    $_SESSION = (array)$_SESSION;
});