PHP - 组合具有相同键值的数组 - PHP - Combine arrays with same key value

PHP - Combine arrays with same key value

本文关键字：键值数组组合 PHP | 更新日期: 2023-09-27

我有一个包含多个对象的 JSON 数组，下面是一个例子：

$people = [{"name":"John", "color":"green"}, 
           {"name":"Mary", "color":"green"}, 
           {"name":"Bob", "color":"red"}]

我使用json_decode($people, true)将它们转换为数组...

现在假设我想组合那些具有相同color的。我必须做array_merge_recursive($people[0], $people[1])因为他们都有green作为color.请注意，我必须指定要递归合并的那些。

如何在

$people解码为数组格式后循环访问并自动递归合并具有相同键值的那些？

像这样：

foreach($people as $person) {
    // If a person has same color of previous
    // person then merge them recursively.
}

这样我就可以在循环后得到这个：

[{"name":"John, Mary", "color":"green, green"}, 
 {"name":"Bob", "color":"red"}]

使结果数组成为按颜色键控的关联数组。

$people_by_color = array();
foreach ($people as $person) {
    if (isset($people_by_color[$person['color']])) {
        $people_by_color[$person['color']]['name'] .= ', ' . $person['name'];
        $people_by_color[$person['color']]['color'] .= ', ' . $person['color'];
    } else {
        $people_by_color[$person['color']] = $person;
    }
}
$people_by_color = array_values($people_by_color); // Turn into indexed array