有没有办法改变array_reduce在 PHP 中使用的数组？
我正在尝试做这样的事情：
给定一些ids 的有序列表：
$array = [["id" => 1], ["id" => 13], ["id" => 4]];
以及一棵具有与相应ids匹配的子树的树：
$tree = [
"id" => 2334,
"children" => [
[
"id" => 111,
"children" => []
],
[
"id" => 1, // <- this is a match
"children" => [
[
"id" => 13, // <- this is a match
"children" => [
[
"id" => 4, // <- this is a match
"children" => []
],
[
"id" => 225893,
"children" => []
],
[
"id" => 225902,
"children" => []
]
]
]
]
]
]
];
如何改变该子树中的数组？
我目前正在尝试使用array_reduce走下树并对其进行变异。但是，突变并未应用于最初传入的$tree.
array_reduce($array, function (&$acc, $item) {
$index = array_search($item['id'], array_column($acc['children'], 'id'));
$acc['children'][$index]['mutated'] = true; // mutation here
return $acc['children'][$index];
}, $tree);
echo "<pre>";
var_dump($tree); // $tree is unchanged here
echo "</pre>";
$tree上面运行后为什么不变异array_reduce？
foreach在这种情况下有没有办法使用？