php - 如何在 PHP 中更改多维数组的键？

Question

我的多维数组命名$cs_map_data如下：

Array
(
    [2] => Array
        (
            [class_id] => 2
            [class_name] => II
            [class_checked] => 0
            [class_subjects] => Array
                (
                    [0] => Array
                        (
                            [cs_map_id] => 81
                            [subject_name] => 11 Engllish
                            [subject_checked] => 0
                            [teacher_cs_id] => 
                        )

                )

        )

    [3] => Array
        (
            [class_id] => 3
            [class_name] => III
            [class_checked] => 0
            [class_subjects] => Array
                (
                    [0] => Array
                        (
                            [cs_map_id] => 155
                            [subject_name] => Hidi
                            [subject_checked] => 0
                            [teacher_cs_id] => 
                        )

                    [1] => Array
                        (
                            [cs_map_id] => 156
                            [subject_name] => 11 Maths
                            [subject_checked] => 0
                            [teacher_cs_id] => 
                        )

                    [2] => Array
                        (
                            [cs_map_id] => 157
                            [subject_name] => 11 Science
                            [subject_checked] => 0
                            [teacher_cs_id] => 
                        )

                    [3] => Array
                        (
                            [cs_map_id] => 158
                            [subject_name] => 11 Engllish
                            [subject_checked] => 0
                            [teacher_cs_id] => 
                        )

                )

        )

    [4] => Array
        (
            [class_id] => 4
            [class_name] => IV
            [class_checked] => 0
            [class_subjects] => Array
                (
                    [0] => Array
                        (
                            [cs_map_id] => 86
                            [subject_name] => Physics
                            [subject_checked] => 0
                            [teacher_cs_id] => 
                        )

                )

        )

    [6] => Array
        (
            [class_id] => 6
            [class_name] => VI
            [class_checked] => 0
            [class_subjects] => Array
                (
                    [0] => Array
                        (
                            [cs_map_id] => 144
                            [subject_name] => Mathematics
                            [subject_checked] => 0
                            [teacher_cs_id] => 
                        )

                    [1] => Array
                        (
                            [cs_map_id] => 145
                            [subject_name] => Biology
                            [subject_checked] => 0
                            [teacher_cs_id] => 
                        )

                )

        )

    [7] => Array
        (
            [class_id] => 7
            [class_name] => VII
            [class_checked] => 0
            [class_subjects] => Array
                (
                    [0] => Array
                        (
                            [cs_map_id] => 129
                            [subject_name] => Physics
                            [subject_checked] => 0
                            [teacher_cs_id] => 
                        )

                    [1] => Array
                        (
                            [cs_map_id] => 130
                            [subject_name] => Chemistry11
                            [subject_checked] => 0
                            [teacher_cs_id] => 
                        )

                    [2] => Array
                        (
                            [cs_map_id] => 131
                            [subject_name] => 11 Science
                            [subject_checked] => 0
                            [teacher_cs_id] => 
                        )

                )

        )

    [8] => Array
        (
            [class_id] => 8
            [class_name] => VIII
            [class_checked] => 0
            [class_subjects] => Array
                (
                    [0] => Array
                        (
                            [cs_map_id] => 67
                            [subject_name] => Hidi
                            [subject_checked] => 0
                            [teacher_cs_id] => 
                        )

                    [1] => Array
                        (
                            [cs_map_id] => 68
                            [subject_name] => 11 Engllish
                            [subject_checked] => 0
                            [teacher_cs_id] => 
                        )

                )

        )

    [9] => Array
        (
            [class_id] => 9
            [class_name] => IX
            [class_checked] => 0
            [class_subjects] => Array
                (
                    [0] => Array
                        (
                            [cs_map_id] => 87
                            [subject_name] => Mathematics
                            [subject_checked] => 0
                            [teacher_cs_id] => 
                        )

                    [1] => Array
                        (
                            [cs_map_id] => 88
                            [subject_name] => Hidi
                            [subject_checked] => 0
                            [teacher_cs_id] => 
                        )

                    [2] => Array
                        (
                            [cs_map_id] => 89
                            [subject_name] => 11 Science
                            [subject_checked] => 0
                            [teacher_cs_id] => 
                        )

                )

        )

)

如果您注意到，数组的键是[2],[3],[4],[6],[7],[8],[9]. 这些键是我从其他开发人员定义的某些功能中获得的。现在我的要求是重命名这些键，即数组键应该是[0],[1],[2],[3],[4],[5],[6]. 其他数组元素和其他键值对应该保持原样。我用谷歌搜索但无法得到解决方案。谁能帮我重新排序这些数组键？提前致谢。我需要的输出如下：

Array
    (
        [0] => Array
            (
                [class_id] => 2
                [class_name] => II
                [class_checked] => 0
                [class_subjects] => Array
                    (
                        [0] => Array
                            (
                                [cs_map_id] => 81
                                [subject_name] => 11 Engllish
                                [subject_checked] => 0
                                [teacher_cs_id] => 
                            )

                )

        )

    [1] => Array
        (
            [class_id] => 3
            [class_name] => III
            [class_checked] => 0
            [class_subjects] => Array
                (
                    [0] => Array
                        (
                            [cs_map_id] => 155
                            [subject_name] => Hidi
                            [subject_checked] => 0
                            [teacher_cs_id] => 
                        )

                    [1] => Array
                        (
                            [cs_map_id] => 156
                            [subject_name] => 11 Maths
                            [subject_checked] => 0
                            [teacher_cs_id] => 
                        )

                    [2] => Array
                        (
                            [cs_map_id] => 157
                            [subject_name] => 11 Science
                            [subject_checked] => 0
                            [teacher_cs_id] => 
                        )

                    [3] => Array
                        (
                            [cs_map_id] => 158
                            [subject_name] => 11 Engllish
                            [subject_checked] => 0
                            [teacher_cs_id] => 
                        )

                )

        )

    [2] => Array
        (
            [class_id] => 4
            [class_name] => IV
            [class_checked] => 0
            [class_subjects] => Array
                (
                    [0] => Array
                        (
                            [cs_map_id] => 86
                            [subject_name] => Physics
                            [subject_checked] => 0
                            [teacher_cs_id] => 
                        )

                )

        )

    [3] => Array
        (
            [class_id] => 6
            [class_name] => VI
            [class_checked] => 0
            [class_subjects] => Array
                (
                    [0] => Array
                        (
                            [cs_map_id] => 144
                            [subject_name] => Mathematics
                            [subject_checked] => 0
                            [teacher_cs_id] => 
                        )

                    [1] => Array
                        (
                            [cs_map_id] => 145
                            [subject_name] => Biology
                            [subject_checked] => 0
                            [teacher_cs_id] => 
                        )

                )

        )

    [4] => Array
        (
            [class_id] => 7
            [class_name] => VII
            [class_checked] => 0
            [class_subjects] => Array
                (
                    [0] => Array
                        (
                            [cs_map_id] => 129
                            [subject_name] => Physics
                            [subject_checked] => 0
                            [teacher_cs_id] => 
                        )

                    [1] => Array
                        (
                            [cs_map_id] => 130
                            [subject_name] => Chemistry11
                            [subject_checked] => 0
                            [teacher_cs_id] => 
                        )

                    [2] => Array
                        (
                            [cs_map_id] => 131
                            [subject_name] => 11 Science
                            [subject_checked] => 0
                            [teacher_cs_id] => 
                        )

                )

        )

    [5] => Array
        (
            [class_id] => 8
            [class_name] => VIII
            [class_checked] => 0
            [class_subjects] => Array
                (
                    [0] => Array
                        (
                            [cs_map_id] => 67
                            [subject_name] => Hidi
                            [subject_checked] => 0
                            [teacher_cs_id] => 
                        )

                    [1] => Array
                        (
                            [cs_map_id] => 68
                            [subject_name] => 11 Engllish
                            [subject_checked] => 0
                            [teacher_cs_id] => 
                        )

                )

        )

    [6] => Array
        (
            [class_id] => 9
            [class_name] => IX
            [class_checked] => 0
            [class_subjects] => Array
                (
                    [0] => Array
                        (
                            [cs_map_id] => 87
                            [subject_name] => Mathematics
                            [subject_checked] => 0
                            [teacher_cs_id] => 
                        )

                    [1] => Array
                        (
                            [cs_map_id] => 88
                            [subject_name] => Hidi
                            [subject_checked] => 0
                            [teacher_cs_id] => 
                        )

                    [2] => Array
                        (
                            [cs_map_id] => 89
                            [subject_name] => 11 Science
                            [subject_checked] => 0
                            [teacher_cs_id] => 
                        )

                )

        )

)

Answer 1

正如 Dave 所建议的，这只是array_values的问题。

在您的情况下，您似乎需要重新索引最外层的数组和下一级的“class_subjects”元素。

对于外层来说，这很容易。假设整个事情都存储在变量中$a，那么

$a = array_values($a);

最外面的数组被重新索引！

内部数组更具挑战性，我建议尝试一下foreach并使用 value 组件的引用。

同样，假设最外面的数组存储在$a其中并且已经被重新索引，现在

$a = array_values($a);
foreach($a as $i => &$sub)
  $sub['class_subjects'] = array_values($sub['class_subjects']);

你就完成了。

Answer 2

在这里，您想重新索引外部数组索引，array_values($arr)将与它完美配合。您可以尝试使用示例。

<?php
$arr = array(
    'foo' => 'foo',
    'bar' => array(
        'baz' => 'baz',
        'candy' => 'candy',
        'vegetable' => array(
            'carrot' => 'carrot',
        )
    ),
    'vegetable' => array(
        'carrot' => 'carrot2',
    ),
    'fruits' => 'fruits',
);
// Pass your array as argument
$arr1 = array_values($arr);
print_r($arr1);
?>

如果您想递归地迭代到内部数组，您可以参考array_values中给出的示例。希望它能解决你的问题。

Answer 3

print_r(array_values($array));