How best to pass a message for the user between pages

function set_message($message_type, $message)
{
    $_SESSION['messages'][$message_type][] = $message
}

function get_messages()
{
    $messages_array = $_SESSION['messages'];
    unset($_SESSION['messages']);
    return $messages_array;
}

<?php class session

public function __construct()
{
	session_start();
}

public function set($name, $value)
{
	$_SESSION[$name] = $value;
}

public function get($name)
{
	return (isset($_SESSION[$name])) ? $_SESSION[$name] : false ;
}

public function delete($name)
{
	unset($_SESSION[$name]);
}

public function destroy()
{
	$_SESSION = array();
	#session_destory();
	#session_regenerate_id();
}