如何将多维数组转换为一维数组

Question

我下面的数组具有多维数组。如何将其转换为一维数组。

Array
(
    [0] => Array
        (
            [id] => 21134
        )

    [1] => Array
        (
            [id] => 21135
        )

    [2] => Array
        (
            [id] => 21137
        )

    [3] => Array
        (
            [id] => 21138
        )

    [4] => Array
        (
            [id] => 21144
        )

    [5] => Array
        (
            [id] => 21147
        )

    [6] => Array
        (
            [id] => 21149
        )

    [7] => Array
        (
            [id] => 21150
        )

    [8] => Array
        (
            [id] => 21151
        )

    [9] => Array
        (
            [id] => 21152
        )

    [10] => Array
        (
            [id] => 21153
        )

)

Answer 1

这种情况array_column()非常有用：

$resultArray = array_column($yourArray,'id');

如果将为您提供一维数组中所有id的值。

请参阅：Oracle docs

Answer 2

使用array_column()

例如：

$array = Array
(
    [0] => Array
        (
            [id] => 21134
        )

    [1] => Array
        (
            [id] => 21135
        )

    [2] => Array
        (
            [id] => 21137
        )

    [3] => Array
        (
            [id] => 21138
        )

    [4] => Array
        (
            [id] => 21144
        )

    [5] => Array
        (
            [id] => 21147
        )

    [6] => Array
        (
            [id] => 21149
        )

    [7] => Array
        (
            [id] => 21150
        )

    [8] => Array
        (
            [id] => 21151
        )

    [9] => Array
        (
            [id] => 21152
        )

    [10] => Array
        (
            [id] => 21153
        )

)

使用array_column()进行转换，

$result = array_column($array,'id');

Answer 3

您可以使用 array_map 将多维数组转换为一维数组

$oneDimensionalArray = array_map('current', $twoDimensionalArray);

您还可以 array_merge

$oneDimensionalArray = call_user_func_array('array_merge', $twoDimensionalArray);