创建多维数组

$user[$user->id]['orders'] = array();

或者

$user[$user->id] = array(
    'orders' => array(
        array(// data for order #1),
        array(// data for order #2),
        array(// data for order #3)
    );
);

// Looping over the orders
foreach($user[$user->id]['orders'] as $order) {
    // Do something with the order
}

你有没有试过类似的方法:

$user[$id] = array_merge($user[$id], array(//values));

给命令一把钥匙

$user[$user->id] = array( "orders" => array(values) );