将多维数组中的重复数组键分组为子数组 [英] Group duplicate array keys in a multidimensional array into subarray

问题描述

我有一个名为 $songs 的多维数组，它输出以下内容:

I have a multidimensional array called $songs, which outputs the following:

Array
(
    [0] => Array
        (
            [Michael Jackson] => Thriller
        )

    [1] => Array
        (
            [Michael Jackson] => Rock With You
        )

    [2] => Array
        (
            [Teddy Pendergrass] => Love TKO
        )

    [3] => Array
        (
            [ACDC] => Back in Black
        )
)

我想合并具有重复键的数组，所以我可以得到以下内容:

I would like to merge the arrays which have duplicate keys, so I can get the following:

Array
(
    [0] => Array
        (
            [Michael Jackson] => Array
            (
                [0] => Thriller
                [1] => Rock With You
            )
        )

    [1] => Array
        (
            [Teddy Pendergrass] => Love TKO
        )

    [2] => Array
        (
            [ACDC] => Back in Black
        )
)

我该怎么做?

为我提供输出数组的代码的奖励积分，如:

Bonus points for giving me the code to output the array like:

<h2>Michael Jackson</h2>
<ul>
    <li>Thriller</li>
    <li>Rock With You</li>
</ul>

<h2>Teddy Pendergrass</h2>
<ul>
    <li>Love TKO</li>
</ul>

<h2>ACDC</h2>
<ul>
    <li>Back in Black</li>
</ul>

推荐答案

这应该可以，这不是您想要的，但我不明白为什么您需要以数字方式对结果数组进行索引，然后艺术家.

This should do it, it's not exactly what you want but I don't see a reason why you'd need to index the resulting array numerically, and then by artist.

$source = array(
    array('Michael Jackson' => 'Thriller'),
    array('Michael Jackson' => 'Rock With You'),
    array('Teddy Pendergrass' => 'Love TKO'),
    array( 'ACDC' => 'Back in Black')
);

$result = array();

foreach($source as $item) {
    $artist = key($item);
    $album = current($item);

    if(!isset($result[$artist])) {
        $result[$artist] = array();
    }
    $result[$artist][] = $album;
}

你可以循环 $result 数组并像这样构建你的 HTML:

And you can loop the $result array and build your HTML like this:

foreach($result as $artist => $albums) {
    echo '<h2>'.$artist.'</h2>';
    echo '<ul>';
    foreach($albums as $album) {
        echo '<li>'.$album.'</li>';
    }
    echo '</ul>';
}

这将导致您描述的类似列表.

Which would result in a similar list that you described.

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