在PHP分组阵列 [英] Grouping arrays in PHP

问题描述

我有200个项目的数组。我想输出数组，但有着共同的价值的项目。类似于SQL的GROUP BY方法。这应该是比较容易做，但我还需要对项目组的计数。

I have an array of 200 items. I would like to output the array but group the items with a common value. Similar to SQL's GROUP BY method. This should be relatively easy to do but I also need a count for the group items.

有没有人有这样做的一个有效的方法？这将发生在每一个页面加载，所以我需要它是快速和可扩展性。

Does anyone have an efficient way of doing this? This will happen on every page load so I need it to be fast and scalable.

我可以prehaps结果转储成类似Lucene的或sqlite的则运行在每个页面加载？

Could I prehaps dump the results into something like Lucene or sqlite then run a query on that document on each page load?

任何想法，将大大AP preciated。

Any thoughts would be greatly appreciated.

推荐答案

只是遍历数组，并使用另一个阵列组。它应该足够快，并且很可能比使用SQLite或相似时​​所涉及的开销更快。

Just iterate over the array and use another array for the groups. It should be fast enough and is probably faster than the overhead involved when using sqlite or similar.

$groups = array();
foreach ($data as $item) {
    $key = $item['key_to_group'];
    if (!isset($groups[$key])) {
        $groups[$key] = array(
            'items' => array($item),
            'count' => 1,
        );
    } else {
        $groups[$key]['items'][] = $item;
        $groups[$key]['count'] += 1;
    }
}

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