提问人：Adrien Hingert 提问时间：11/16/2023 最后编辑：mickmackusaAdrien Hingert 更新时间：11/21/2023 访问量：74
使用已知的父键将静态关联元素推送到已知级别的所有子数组中
Push a static associative element into all subarrays on a known level with a known parent key
问：
我有一个动态生成的PHP多维数组，如下所示：
Array (
[uid_1] => Array (
[sub_1] => Array (
[sub_sub_1] => Array (
[id1] => "val_1",
[id2] => "val_2"
)
)
[sub_2] => Array (
[sub_sub_1] => Array (
[id1] => "val_1",
[id2] => "val_2"
),
[sub_sub_2] => Array (
[id3] => "val_3",
[id4] => "val_4"
)
)
)
)
数组要大得多，将包含多个 [uid]、[sub] 和 [sub_sub]。
请注意，虽然 [uid] 和 [sub] 是唯一的，但 [sub_sub] 不是。
是否可以在不使用循环且不知道 [uid_1] 和 [sub_2] 的值的情况下将 [id5] => “val_5” 添加到 [sub_sub_1] 的所有实例中？
答：
0赞
Jenson M John
11/16/2023
#1
由于您提到数组要大得多，因此可能需要 Loop。
<?php
$mainArray = array (
"uid_1" => array (
"sub_1" => array (
"sub_sub_1" => array (
"id1" => "val_1",
"id2" => "val_2"
)
),
"sub_2" => array (
"sub_sub_1" => array (
"id1" => "val_1",
"id2" => "val_2"
),
"sub_sub_2" => array (
"id3" => "val_3",
"id4" => "val_4"
)
)
)
);
echo "<pre>";
print_r( $mainArray );
echo "</pre>";
foreach($mainArray["uid_1"] as $key=>$val){
//$val (Arrays with index 'sub_1', 'sub_2' etc.)
//Get array with index 'sub_sub_1' & Assign a New Value with key `id5`.
$mainArray["uid_1"][$key]['sub_sub_1']["id5"] = "val_5";
}
echo "<pre>";
print_r( $mainArray );
echo "</pre>";
?>
2赞
Ishtiaq Ahmed
11/16/2023
#2
请尝试以下代码。
<?php
$mainArray = array(
"uid_1" => array(
"sub_1" => array(
"sub_sub_1" => array(
"id1" => "val_1",
"id2" => "val_2"
)
),
"sub_2" => array(
"sub_sub_1" => array(
"id1" => "val_1",
"id2" => "val_2"
),
"sub_sub_2" => array(
"id3" => "val_3",
"id4" => "val_4"
)
)
)
);
echo "<pre>";
print_r($mainArray);
echo "</pre>";
foreach ($mainArray["uid_1"] as $key => $val) {
// Check if 'sub_sub_1' exists before trying to access it
if (isset($mainArray["uid_1"][$key]['sub_sub_1'])) {
// Get array with index 'sub_sub_1' & Assign a New Value with key `id5`.
$mainArray["uid_1"][$key]['sub_sub_1']["id5"] = "val_5";
}
}
echo "<pre>";
print_r($mainArray);
echo "</pre>";
?>
评论
0赞
mickmackusa
11/21/2023
这不太可能是一个完全实现的解决方案，因为您正在对访问进行硬编码 -- 这实际上应该是另一个。Asker 说道：uid_1foreach()without knowing the value of [uid_1] and [sub_2]
1赞
lukas.j
11/16/2023
#3
$array = [
'uid_1' => [
'sub_1' => [
'sub_sub_1' => [ 'id1' => 'val_1', 'id2' => 'val_2' ]
],
'sub_2' => [
'sub_sub_1' => [ 'id1' => 'val_1', 'id2' => 'val_2' ],
'sub_sub_2' => [ 'id3' => 'val_3', 'id4' => 'val_4' ]
]
],
'uid_2' => [
'sub_1' => [
'sub_sub_1' => [ 'id1' => 'val_1', 'id3' => 'val_3' ]
],
]
];
$iterator = new RecursiveIteratorIterator(
new RecursiveArrayIterator($array),
RecursiveIteratorIterator::SELF_FIRST
);
$iterator->setMaxDepth(2);
while ($it->valid()) {
if ($it->key() === 'sub_sub_1') {
$array[$it->getSubIterator(0)->key()][$it->getSubIterator(1)->key()]['sub_sub_1']['id5'] = 'val_5';
}
$it->next();
}
print_r($array);
输出：
Array
(
[uid_1] => Array
(
[sub_1] => Array
(
[sub_sub_1] => Array
(
[id1] => val_1
[id2] => val_2
[id5] => val_5
)
)
[sub_2] => Array
(
[sub_sub_1] => Array
(
[id1] => val_1
[id2] => val_2
[id5] => val_5
)
[sub_sub_2] => Array
(
[id3] => val_3
[id4] => val_4
)
)
)
[uid_2] => Array
(
[sub_1] => Array
(
[sub_sub_1] => Array
(
[id1] => val_1
[id3] => val_3
[id5] => val_5
)
)
)
)
笔记：
访问阵列的每个顶部节点。包装 和 将访问数组的每个节点，而不仅仅是顶部节点。并确保我们不会浪费时间访问超过三级深度的节点。RecursiveArrayIteratorRecursiveIteratorIteratorRecursiveArrayIteratorsetMaxDepth
我们进行迭代，检查键是否为“sub_sub_1”，如果为 true，则通过调用获取父路径部分。然后我们只需创建键并赋值。getSubIterator->key
0赞
mickmackusa
11/21/2023
#4
不要费心试图让一个简单的任务变得更加复杂。使用函数进行迭代可能需要更长的时间，并且更难理解。
使用两个嵌套循环，通过引用修改数据集，并在需要时无条件推送所需的关联元素。
即使数据集（子数组）没有级别，此脚本也会创建级别并安全地将所需元素推送到其中。如果这不是所需的行为，则应提供更具代表性的示例输入数组，并表达应如何处理此边缘情况。sub_sub_1
代码：（演示)
foreach ($array as &$uids) {
foreach ($uids as &$subs) {
$subs['sub_sub_1']['id5'] = 'val_5';
}
}
var_export($array);
输出：
array (
'uid_1' =>
array (
'sub_1' =>
array (
'sub_sub_1' =>
array (
'id1' => 'val_1',
'id2' => 'val_2',
'id5' => 'val_5',
),
),
'sub_2' =>
array (
'sub_sub_1' =>
array (
'id1' => 'val_1',
'id2' => 'val_2',
'id5' => 'val_5',
),
'sub_sub_2' =>
array (
'id3' => 'val_3',
'id4' => 'val_4',
),
),
),
'uid_2' =>
array (
'sub_1' =>
array (
'sub_sub_1' =>
array (
'id1' => 'val_1',
'id3' => 'val_3',
'id5' => 'val_5',
),
),
),
)
评论