删除多维数组的深层子数组中的空元素[重复]

Question

我想过滤多维数组的一部分。我使用了

array_filter

功能。当我打印过滤后的数据时，它显示正确，但我似乎无法将数据保存回数组。

这是预先的多维数组（称为

$posted_product_details

），包含我想要过滤的内部数组（

[data]

）：

Array
(
[column_1] => Array
    (
        [name] => Colour
        [data] => Array
            (
                [0] => Blue
                [1] => Green
                [2] => Red
                [3] => Yellow
                [4] => 
                [5] => 
                [6] => 
                [7] => 
                [8] => 
                [9] => 
            )

    )

[column_2] => Array
    (
        [name] => Pack QTY
        [data] => Array
            (
                [0] => 3
                [1] => 3
                [2] => 3
                [3] => 3
                [4] => 
                [5] => 
                [6] => 
                [7] => 
                [8] => 
                [9] => 
            )

    )

[column_3] => Array
    (
        [name] => Product Code
        [data] => Array
            (
                [0] => 65030
                [1] => 65029
                [2] => 65028
                [3] => 65031
                [4] => 
                [5] => 
                [6] => 
                [7] => 
                [8] => 
                [9] => 
            )

    )

[column_4] => Array
    (
        [name] => Barcode
        [data] => Array
            (
                [0] => 5099570650307
                [1] => 5099570650291
                [2] => 5099570650284
                [3] => 5099570650314
                [4] => 
                [5] => 
                [6] => 
                [7] => 
                [8] => 
                [9] => 
            )

    )

[column_5] => Array
    (
        [name] => 
        [data] => Array
            (
                [0] => 
                [1] => 
                [2] => 
                [3] => 
                [4] => 
                [5] => 
                [6] => 
                [7] => 
                [8] => 
                [9] => 
            )

    )

)

这里我尝试循环遍历数组并过滤数据：

foreach ($posted_product_details as $column => $info) {
    $name = $info['name'];
    $data = $info['data'];
    $info['data'] = array_filter($data);
}

但是，在之后打印数组时，数组并没有改变。

Answer 1

通过引用传递值来修改原始数组：

foreach ($posted_product_details as $column => & $info) {
    $name = $info['name'];
    $data = $info['data'];
    $info['data'] = array_filter($data);
}

这将正确过滤数组的

data

部分。但是，如果您需要过滤掉更深的元素，则必须使用递归函数，例如 this one。

演示！

Answer 2

当您迭代数组时，foreach 构造会为数组的每个部分创建一个副本。您必须显式调用原始数组才能对其进行编辑：

$posted_product_details[$column]['data'] = array_filter($data);