Question

所以我想列出相册，其中每张专辑都包含单张照片。这类似于每个类别都有帖子的类别。我有两个数据库表，即＆＃34;专辑＆＃34;和＆＃34;照片＆＃34;。相册表包含列id，album_name和album_description。照片表包含列ID，photo_is_in，photo_name和photo_description。

我使用INNER JOIN来合并相册和照片表，以生成下面的平面$ albums数组：

<?php

$albums  = [
['album_id' => '1', 'photo_id' => '41', 'album_name' => 'album_1', 'album_description' => 'Album 1 description', 'photo_is_in' => 'album_1', 'photo_name' => 'photo_1.jpg', 'photo_description' => 'Photo 1 description'],

['album_id' => '1', 'photo_id' => '42', 'album_name' => 'album_1', 'album_description' => 'Album 1 description', 'photo_is_in' => 'album_1', 'photo_name' => 'photo_2.jpg', 'photo_description' => 'Photo 2 description'],

//==================

['album_id' => '2', 'photo_id' => '43', 'album_name' => 'album_2', 'album_description' => 'Album 2 description', 'photo_is_in' => 'album_2', 'photo_name' => 'photo_3.jpg', 'photo_description' => 'Photo 3 description'],

['album_id' => '2', 'photo_id' => '44', 'album_name' => 'album_2', 'album_description' => 'Album 2 description', 'photo_is_in' => 'album_2', 'photo_name' => 'photo_4.jpg', 'photo_description' => 'Photo 4 description'],

];

?>

我想将上面的$ albums数组转换为如下所示的分层数组：

<?php

$sameAlbums = Array(

        'album_1' => Array( //comes from 'album_name' => 'album_1' in the $data array above
            'album_id' => '1',
            'album_description' => 'Album 1 description',
            'album_1' => Array( //comes from 'photo_is_in' => 'album_1' in the $data array above

                'photo_1.jpg' => Array( 
                    'photo_id' => '41',
                    'photo_description' => 'Photo 1 description',

                ), 


                'photo_2.jpg' => Array( 
                    'photo_id' => '42',
                    'photo_description' => 'Photo 2 description',

                ) 


            )

        ),

        //============================================

    'album_2' => Array( //comes from 'album_name' => 'album_2' in the $data array above
        'album_id' => '2',
        'album_description' => 'Album 2 description',
        'album_2' => Array( //comes from 'phot_is_in' => 'album_2' in the $data array above

            'photo_3.jpg' => Array( 
                'photo_id' => '43',
                'photo_description' => 'Photo 3 deescription',

            ), 


            'photo_3.jpg' => Array( 
                'photo_id' => '44',
                'photo_description' => 'Photo 4 deescription',

            ) 


        ) 

    ) 

);

?>

我尝试过这样的事情并没有按预期工作，我需要帮助：

<?php
$grouping = [];
foreach($albums as $albumName){
    //Grouping data by album name
    $grouping[$albumName['album_name']][] = $albumName; 
}

echo "<pre>";
print_r($grouping);

?>

我觉得我的解决方案还不够，但我缺乏想法。

Answer 1

尝试这样的事情：

$grouping = [];
foreach($albums as $album) {
    if (!isset($grouping[$album['album_id']])) {
        $grouping[$album['album_id']] = [
            'album_id'          => $album['album_id'],
            'album_name'        => $album['album_name'],
            'album_description' => $album['album_description'],
            'photos' => []
        ];
    }
    $grouping[$album['album_id']]['photos'][$album['photo_id']] = [
        'photo_id'          => $album['photo_id'],
        'photo_name'        => $album['photo_name'],
        'photo_description' => $album['photo_description']
    ]; 
}

演示：http://rextester.com/GBW65553

但通常我只会运行两个查询。首先获取相册并初始化空数组以获取照片。然后获取照片并将其分配到相关相册。

正如@mickmackusa在评论中指出的那样，指数与问题中预期结果的指数不同。这不是一个错误。我就是这样做的。但如果您确实需要与问题完全相同的结果，则可以将代码调整为：

$grouping = [];
foreach($albums as $album) {
    if (!isset($grouping[$album['album_name']])) {
        $grouping[$album['album_name']] = [
            'album_id'          => $album['album_id'],
            'album_name'        => $album['album_name'],
            'album_description' => $album['album_description'],
            $album['album_name'] => []
        ];
    }
    $grouping[$album['album_name']][$album['album_name']][$album['photo_name']] = [
        'photo_id'          => $album['photo_id'],
        'photo_name'        => $album['photo_name'],
        'photo_description' => $album['photo_description']
    ]; 
}

演示：http://rextester.com/LUZIG46060

将平面多维数组转换为分层数组 - 用于专辑和照片

1 个答案: