Question

我有一个这样的数组：

Array
(
    [0] => Array
        (
            [0] => element 1
            [1] => Array
                (
                    [0] => white house history
                    [1] => white house historical association
                    [2] => white house hotel istanbul
                    [3] => white house high school
                )

        )

    [1] => Array
        (
            [0] => element 2
            [1] => Array
                (
                    [0] => white kilt hose
                    [1] => white knight hose
                    [2] => white house kennels
                    [3] => white house kinsale
                )

        )

    [2] => Array
        (
            [0] => element 3
            [1] => Array
                (
                    [0] => white house news
                    [1] => white house nannies
                    [2] => white house number
                    [3] => white house nominations

                )

        )

我想创建一个新数组，其中只包含每个数组中的元素：

[0] => white house history
[1] => white house historical association
[2] => white house hotel istanbul
[3] => white house high school
[4] => white kilt hose
[5] => white knight hose
[6] => white house kennels
[7] => white house kin sale
[8] => white house news
[9] => white house nannies
[10] => white house number
[11] => white house nominations

有人知道怎么做吗？

Answer 1

<?php
$names = array();
foreach ($arr as $k => $v) {
    if (! empty($v[1])) {
        foreach ($v[1] as $elem) {
            $names[] = $elem;
        }
    }
}
?>

<强>解释

您需要驻留在每个数组的第二部分中的所有元素。

循环主阵列。

转到子数组的第二部分，这些是您想要的名称。

只需将它们附加到空白（必需）数组，我们就可以得到输出。

Please see demo

Answer 2

通常我会鼓励你先尝试一下，但为了教学，这里有一些评论代码：

$newArray = []; // use array() for PHP before 5.4, I think
foreach($oldArray as $subArray) { // process top-level elements
    bool $firstElement = true;  // flag to indicate if we've gone past 1 element yet
    foreach($subArray as $element) { // process second-level elements
        if(!firstElement && is_array($element)) { // look for arrays that come after first element
            $newArray = array_merge($newArray, $element);
        }
        $firstElement = false;  // unset the flag
    }
}

编辑：澄清要求后，实现嵌套循环和$ firstElement标志

多维数组转换

2 个答案: