遍历数组的所有键

Question

我想在php

中遍历数组的所有键

[Field_1] => SOME VALUE
[Field_2] => Array
    (
    )

[Field_3] => Array
    (
    )

[Field_4] => SOME VALUE
[Field_5] => Array
    (
    )

[Field_6] => Array
    (
    )

[Field_7] => SOME VALUE
[Field_8] => SOME VALUE
[Field_9] => SOME VALUE
[Field_10] => Array
    (
        [Field_10.1] => Array
            (
                [0] => Array
                    (
                        [key_1] => SOME VALUE
                        [key_2] => SOME VALUE
                        [key_3] => SOME VALUE
                        [key_4] => Array
                            (
                            )

                        [key_5] => SOME VALUE
                        [key_6] => SOME VALUE
                            (
                            )

                    )

                [1] => Array
                    (
                        [key_1] => SOME VALUE
                        [key_2] => SOME VALUE
                        [key_3] => SOME VALUE
                        [key_4] => Array
                            (
                            )

                        [key_5] => SOME VALUE
                        [key_6] => Array
                            (
                            )

                    )

                [2] => Array
                    (
                        [key_1] => SOME VALUE
                        [key_2] => SOME VALUE
                        [key_3] => SOME VALUE
                        [key_4] => Array
                            (
                            )

                        [key_5] => SOME VALUE
                        [key_6] => Array
                            (
                            )

                    )

            )

    )

[Field_11] => Array
    (
    )

如何遍历上面数组中的所有键和嵌套键。最好使用递归函数，我想遍历数组并找出数组中的特定键。

Answer 1

function traverse_keys($arr) {
    foreach($arr as $key => $value) {
        if(is_array($value) && !empty($value)) {
            echo "<p style='font-weight: bold'>{$key}</p>";
            traverse_keys($value);
        } else {
            echo "<p>{$key}</p>";
        }
    }
}

traverse_keys($arr);

此代码打印出所有外键和内键。以粗体显示的键是子数组的父键。希望它有所帮助！