PHP 数组 - 获取所有子值

Question

我正在尝试从下面的数组中获取所有 [labels] 及其 [id]。

Array
(
    [0] => Array
        (
            [elements] => Array
                (
                    [0] => Array
                        (
                            [id] => 3
                            [label] => This is a Page 1 Question 1
                        )
                    [1] => Array
                        (
                            [id] => 4
                            [label] => This is a Page 1 Question 2
                        )
                )
        )

    [1] => Array
        (
            [elements] => Array
                (
                    [0] => Array
                        (
                            [id] => 10
                            [label] => This is a Page 2 Question 1
                        )
                    [1] => Array
                        (
                            [id] => 13
                            [label] => This is a Page 2 Question 2                          
                        )
                )
        )

    [2] => Array
        (
            [elements] => Array
                (
                    [0] => Array
                        (
                            [id] => 18
                            [label] => This is a Page 3 Question 1                           
                        )
                    [1] => Array
                        (
                            [id] => 21
                            [label] => This is a Page 3 Question 2                           
                        )
                )
        )
)

我做了一些研究并尝试使用下面的代码，但它 return 其他东西。

foreach($elements as $key => $value) {
     echo $value['label'];
     echo $value['id'];
}

请帮帮我。

Answer 1

使用这样的数组结构你应该迭代两次:

foreach ($elements as $key => $value) {
    foreach ($value['elements'] as $element) {
        echo $element['label'];
        echo $element['id'];
    }
}