如何访问对象数据的多个数组？

Question

stdClass Object
(
    [Id] => 23490
    [Receipt] => 7684454
    [DateTime] => 2019-04-23T19:17:28.000
    [Type] => Consumer
    [Transactions] => Array
        (
            [0] => stdClass Object
                (
                    [PacId] => 90
                    [Label] => GDHSGSHE562543
                    [Name] => VHSS - AS-89
                    [Sold] => 27.9
                    [Unit] => Grams
                    [Abbreviation] => g
                    [Price] => 198
                    [State] => 
                    [Date] => 
                    [LastModified] => 2019-04-23T19:17:29+00:00
                )

        )

    [Final] => 
    [Date] => 
    [LastModified] => 2019-04-23T19:17:29+00:00
)

我正在使用以下代码，但对我不起作用。我想使用下面的代码访问所有带有值的名称，但对我不起作用。我该怎么解决？

$iterator = new RecursiveArrayIterator($f_data);

            while ($iterator->valid()) {

                if ($iterator->hasChildren()) {
                    // print all children
                    foreach ($iterator->getChildren() as $key => $value) {
                        echo $key . ' : ' . $value . "\n";
                    }
                } else {
                    echo "No children.\n";
                }

                $iterator->next();
            }

我想要输出如下

stdClass Object
    (
        [Id] => 23490
        [Receipt] => 7684454
        [DateTime] => 2019-04-23T19:17:28.000
        [Type] => Consumer
        [Transactions] => Array
        [PacId] => 90
        [Label] => GDHSGSHE562543
        [Name] => VHSS - AS-89
        [Sold] => 27.9
        [Unit] => Grams
        [Abbreviation] => g
        [Price] => 198
        [State] => 
        [Date] => 
        [LastModified] => 2019-04-23T19:17:29+00:00
        [Final] => 
        [Date] => 
        [LastModified] => 2019-04-23T19:17:29+00:00
    )

Answer 1

$f_data->Transactions是一个包含对象的数组，因此它将引发该错误：

Recoverable fatal error: Object of class stdClass could not be converted to string

---

RecursiveIteratorIterator类

更简单的解决方案是也使用RecursiveIteratorIterator类。

$obj = (your_object_here);

var_dump(flat($obj));

function flat($iterable) {
    $arr = [];
    $iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($iterable));

    foreach ($iterator as $key => $value) {
        $arr[$key] = $value;
    }

    return (object)$arr;
}

Test it on 3v4l.org

---

仅RecursiveArrayIterator类

另一种解决方案可能是具有一个递归函数，当迭代器遇到带有子元素（数组或对象）的元素时，该函数将自行调用。

$obj = (your_object_here);

var_dump(flat($obj));

function flat($iterable) {
    $arr = [];

    $iterator = (get_class($iterable) === RecursiveArrayIterator::class)
        ? $iterable
        : new RecursiveArrayIterator($iterable);

    while($iterator->valid()) {
        if ($iterator->hasChildren()) {
            $arr = array_merge($arr, (array)flat($iterator->getChildren()));
        } else {
            $arr[$iterator->key()] = $iterator->current();
        }

        $iterator->next();
    }

    return (object)$arr;
}

Test it on 3v4l.org

---

foreach语句

或者您可以只使用递归foreach语句。

$obj = (your_object_here);

var_dump(flat($obj));

function flat($iterable) {
    $arr = [];

    foreach ($iterable as $key => $element) {
        if (is_array($element) || is_object($element)) {
            $arr = array_merge($arr, (array)flat($element));
        } else {
            $arr[$key] = $element;
        }
    }

    return (object)$arr;
}

Test it on 3v4l.org