php如何访问对象数组

Question

How to access the item array from the following object array

Cart66Cart Object
(
[_items:Cart66Cart:private] => Array
    (
        [2] => Cart66CartItem Object
            (
                [_productId:Cart66CartItem:private] => 327
                [_quantity:Cart66CartItem:private] => 3
                [_optionInfo:Cart66CartItem:private] => 
                [_priceDifference:Cart66CartItem:private] => 0
                [_customFieldInfo:Cart66CartItem:private] => 
                [_productUrl:Cart66CartItem:private] => http://localhost/odesk/cart66/fran-wilson-aloe-lip-care/
                [_formEntryIds:Cart66CartItem:private] => Array
                    (
                    )

            )

        [3] => Cart66CartItem Object
            (
                [_productId:Cart66CartItem:private] => 368
                [_quantity:Cart66CartItem:private] => 2
                [_optionInfo:Cart66CartItem:private] => 
                [_priceDifference:Cart66CartItem:private] => 0
                [_customFieldInfo:Cart66CartItem:private] => 
                [_productUrl:Cart66CartItem:private] => http://localhost/odesk/cart66/beauty-strokes-basic-shadow-brush/
                [_formEntryIds:Cart66CartItem:private] => Array
                    (
                    )

            )

    )

[_promotion:Cart66Cart:private] => 
[_promoStatus:Cart66Cart:private] => 0
[_shippingMethodId:Cart66Cart:private] => 13
[_liveRates:Cart66Cart:private] => Cart66LiveRates Object
    (
        [toZip] => 
        [weight] => 
        [rates] => Array
            (
            )

        [_toCountryCode:protected] => 
    )

)

Answer 1

If you must access a private/protected class property you can simply use the magic __get method . Reflection would be way overboard in this case. Whether or not it makes good design sense to use the magic methods in this case depends on your situation, though.

class MyClass
{
    private $_items;

    public function __get($prop)
    {
        if ($prop == '_items') {
            return $this->_items;
        }
        throw new OutOfBoundsException;
    }
}

UPDATE

After re-reading it seems you simply want your object to behave like an array. To do this you'll need to implement ArrayAccess and point the relevant methods to the private $_items property.

class MyClass implements ArrayAccess
{
    private $_items = array();

    public function __construct() {
        $this->_items = array(
            "one"   => 1,
            "two"   => 2,
            "three" => 3,
        );
    }
    public function offsetSet($offset, $value) {
        if (is_null($offset)) {
            $this->_items[] = $value;
        } else {
            $this->_items[$offset] = $value;
        }
    }
    public function offsetExists($offset) {
        return isset($this->_items[$offset]);
    }
    public function offsetUnset($offset) {
        unset($this->_items[$offset]);
    }
    public function offsetGet($offset) {
        return isset($this->_items[$offset]) ? $this->_items[$offset] : null;
    }
}

And finally , PHP comes with a built-in ArrayObject class that will make an object behave very much like an array. You could always use that and point the relevent methods at a private $_items property.

Answer 2

Something like this maybe:

$object->_items[index]->_productId

But if _items is private you will need a public getter or mess with the Reflection classes. You can set the the private property to be accessible through ReflectionProperty Try this:

    $reflectionObject = new ReflectionObject($yourObject);
    $property = $reflectionObject->getProperty('_items');
    $property->setAccessible(true);
    $items = $property->getValue($yourObject);

Answer 3

请尝试以下方法：

$object->$first_node->$second_node->$third_node;