PHP-扁平阵列

Question

使用PHP构造这样的阵列的简便方法是什么？

Array
(
    [0] => Array
        (
            [category] => vegetable
            [type] => garden
            [name] => cabbage
        )
    [1] => Array
        (
            [category] => vegetable
            [type] => garden
            [name] => eggplant
        )
    [2] => Array
        (
            [category] => fruit
            [type] => citrus
        )
)

我目前正在为此解决解决方案。
    

可能不是“美丽”的方式，而只是这样的东西？

$newArray = array();    

foreach($currentArray as $item)
{
    if(!empty($item['children']) && is_array($item['children']))
    {
        foreach($item['children'] as $children)
        {
            $newArray[] = array( 'category'=>$item['category'] , 'type'=>$item['type'] , 'name'=>$children['name']);
        }
    }
    else
    {
        $newArray[] = array( 'category'=>$item['category'] , 'type'=>$item['type']);
    }
}

Answer 1

children

降低层次结构吗？

<?php

function transform_impl($arr, $obj, &$res) {
    $res = array();
    foreach ($arr as $item) {
        $children = @$item['children'];
        unset($item['children']);
        $res[] = array_merge($obj, $item);
        if ($children) {
            transform_impl($children, array_merge($obj, $item), $res);
        }
    }
}

function transform($arr) {
    $res = array();
    transform_impl($arr, array(), $res);
    return $res;
}

print_r(transform(array(
    array("category" => "vegetable", "type" => "garden", "children" =>
        array(array("name" => "cabbage"), array("name" => "eggplant"))
    ),
    array("category" => "fruit", "type" => "citrus")
)));

Answer 2

http：//ideone.com/0wo4wu

在每个父级上列出。如果没有孩子，请将父级推入结果数组。如果有孩子，请在推入结果阵列之前将家长数据预先到子数据中。 demo

$result = [];
foreach ($array as $set) {
    // no children
    if (!is_array($set['children'] ?? null)) {
        $result[] = $set;
        continue;
    }
    // isolate parent data
    $parent = [
        'category' => $set['category'],
        'type' => $set['type']
    ];
    // push merged parent-child sets into result
    array_push(
        $result,
        ...array_map(
            fn($child) => $parent + $child,
            $set['children']
        )
    );
}
var_export($result);

Answer 3