策略在PHP自定义阵列功能 [英] Strategies for Custom Array Functionality in PHP

问题描述

我发现自己经常与寻求解决在PHP中的各种阵列布置的问题，回落的解决方案之外，我已经实施过挣扎。

I find myself often struggling with finding a solution to various array arrangement problems in PHP that fall outside of solutions that I have implemented before.

目前，我开始用此阵：

$tags = array(
            array('tag_id' => 1, 'tag_name' => 'Hello', 'album_id => 1'),
            array('tag_id' => 1, 'tag_name' => 'Hello', 'album_id => 2'),
            array('tag_id' => 2, 'tag_name' => 'World', 'album_id => 1'),
            array('tag_id' => 2, 'tag_name' => 'World', 'album_id => 2'),
            array('tag_id' => 3, 'tag_name' => 'Again', 'album_id => 3')
        );

和想组织它是这样：

$organized_tags = array(

            array('tag_id' => 1, 'tag_name' => 'Hello', 'album_ids' => array(1,2)),
            array('tag_id' => 2, 'tag_name' => 'World', 'album_ids' => array(1,2)),
            array('tag_id' => 3, 'tag_name' => 'Again', 'album_ids' => array(3))
        );

A）这将是解决此类问题的最佳策略是什么？
二）如何看待解决了上来在未来的通用阵列的问题？

a) what would be the best strategy for solving this kind of problem? b) how to think about solving generic array problems that come up in the future?

推荐答案

我可能需要从树叶中重新presenting模型数据本书的CakePHP作为数组。

I might take a leaf from the book of CakePHP in representing model data as arrays.

有了这个，你将有一个标签模式，以及相册样板。从数据给予，标签模型看起来像

With this, you would have a Tag model, and an Album model. From the data give, the Tag model looks like

['Tag' => ['tag_id' => 1, 'tag_name' => 'Hello']]

和，就目前而言，该专辑只具有ID

And, for the moment, the Album only has the id

['Album' => ['album_id' => 1']]

要重新present有组织的结构：

To represent the organized structure:

[
    0 => [
        'Tag' => ['tag_id' => 1, 'tag_name' => 'Hello'],
        'Album' => [
            0 => ['album_id' => 1],
            1 => ['album_id' => 2]
        ],
    1 => [
        'Tag' => ['tag_id' => 2, 'tag_name' => 'World'],
        'Album' => [
            0 => ['album_id' => 1],
            1 => ['album_id' => 2]
        ],
    2 => [
        'Tag' => ['tag_id' => 3, 'tag_name' => 'Again'],
        'Album' => [
            0 => ['album_id' => 3]
        ]
]

然而，这是不是你问什么。

However, this isn't what you've asked for.

要修改 $标记到 $ organized_tag​​s ，我会做一个标记模型类，通过它采用 $标记结构，迭代，并建立第二个结构。

To change $tags to $organized_tags, I'd do a Tag model class that takes the $tags structure, iterates through it, and builds the second structure.

public function toOrganizedTags($tags) {
    $organizedTags = [];
    foreach ($tags as $tag) {
        if (!isset($organizedTags[$tag['tag_id']]) {
            // make sure an entry exists. We assume that tag_name does not change between similar tag_id entries.
            $organizedTags[$tag['tag_id']] = [
                'tag_id' => $tag['tag_id'], 
                'tag_name' => $tag['tag_name'],
                'album_ids' => []
            ];
        }
        $organizedTags[$tag['tag_id']]['album_ids'][] = $tag['album_id'];
    }
    // use array_values to strip the indexed keys
    return array_values($organizedTags);
}

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