如何在PHP中的关联数组中插入新的键值对

我有一个名为$classes_data的关联数组，如下所示：

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(是这样的，而不是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的密钥class_checked，并将其初始值设置为0(即class_checked =>"0"(。

我尝试了很多技巧，但都无法获得所需的数组格式。有人能帮我得到想要的数组吗？提前谢谢。

供您参考，阵列$classes_data所需的阵列格式如下：

尝试：

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

$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);

给定初始$classes_data，您可以执行以下操作：

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

现在数组应该是您想要的样子。

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