php - 如何在 PHP 的关联数组中插入新的键值对？

Question

我有一个关联数组，命名$classes_data如下：

Array
(
    [2] => Array
        (
            [class_id] => 2
            [class_name] => II
            [subjects] => Array
                (
                    [0] => 11 Engllish
                )

        )

    [3] => Array
        (
            [class_id] => 3
            [class_name] => III
            [subjects] => Array
                (
                    [0] => Hidi
                    [1] => 11 Maths
                    [2] => 11 Science
                    [3] => 11 Engllish
                )

        )

    [4] => Array
        (
            [class_id] => 4
            [class_name] => IV
            [subjects] => Array
                (
                    [0] => Physics
                )

        )

    [6] => Array
        (
            [class_id] => 6
            [class_name] => VI
            [subjects] => Array
                (
                    [0] => Mathematics
                    [1] => dfadadadsagfasrsarasrarBiology
                )

        )

    [7] => Array
        (
            [class_id] => 7
            [class_name] => VII
            [subjects] => Array
                (
                    [0] => Physics
                    [1] => Chemistry11
                    [2] => 11 Science
                )

        )

    [8] => Array
        (
            [class_id] => 8
            [class_name] => VIII
            [subjects] => Array
                (
                    [0] => Hidi
                    [1] => 11 Engllish
                )

        )

    [9] => Array
        (
            [class_id] => 9
            [class_name] => IX
            [subjects] => Array
                (
                    [0] => Mathematics
                    [1] => Hidi
                    [2] => 11 Science
                )

        )

)

数组的键（即 2,3,4,6,7,8,9）以这种方式代替 0,1,2,3,4,5,6，因为我使用了一个函数来重新排列这些键。

现在我要做的是插入一个新键class_checked并将其初始值设置为0（即class_checked =>"0"）。

我尝试了很多技巧，但无法获得所需的数组格式。任何人都可以帮助我获得所需的阵列吗？提前致谢。

供您参考，数组所需的数组格式$classes_data如下：

score 4 · Accepted Answer

$array = array_map(function (array $i) { return $i + array('class_checked' => 0); }, $array);

或者：

foreach ($array as &$i) {
    $i['class_checked'] = 0;
}
unset($i);

score 4 · Accepted Answer

4

尝试：

foreach($classes_data as $key=>$value) {
    $classes_data[$key]['class_checked'] = 0;
}

于 2013-05-07T06:44:00.653 回答

score 0 · Accepted Answer

给定您的初始值$classes_data，您可以这样做：

foreach($classes_data as &$class) {
  $class['class_checked'] = 0;
}

现在数组应该是你想要的。

php - 如何在 PHP 的关联数组中插入新的键值对？

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