如何在多维数组中组合第一个键值?

Question

我有一个从 CSV 文件创建的数组，我想使用每个数组中的第一个值作为键，并将数组与数组中相同的第一个值组合在一起。所有带有[Parent] => top的数组都应合并为一个数组[top] => Array。以下是 CSV 文件中的内容示例。有未知数量的菜单项。唯一已知的是菜单只有 3 层深 Top>Sub1>Sub2。此外，顶部菜单的菜单项也可以更改。我将需要一些可以查看第一个数组中的 [Parent] 键的东西，如果它等于"top"，则基于键 [MenuItem] 创建一个数组，然后是任何其他数组，其中 [Parent]=Programs，然后 [MenuItem] 和 [URL] 将被添加到程序数组中。

Array
(
[0] => Array
(
[Parent] => top
[MenuItem] => Home
[URL] => /
)
[1] => Array
(
[Parent] => top
[MenuItem] => Programs
[URL] => /programs/
)
[2] => Array
(
[Parent] => Programs
[MenuItem] => Programs Sub1
[URL] => /programs/sub1/
)
[3] => Array
(
[Parent] => Programs
[MenuItem] => Programs Sub2
[URL] => /programs/sub2/
)
[4] => Array
(
[Parent] => Programs
[MenuItem] => Programs Sub3
[URL] => /programs/sub3/
)
)

结果应为：

Array
(
[top] => Array
(
[0] => Array
(
[MenuItem] => Home
[URL] => /
)
[1] => Array
(
[MenuItem] => Programs
[URL] => /programs/
[Programs] => Array
(
[0] => Array
(
[MenuItem] => Programs Sub1
[URL] => /programs/sub1/
)
[1] => Array
(
[MenuItem] => Programs Sub2
[URL] => /programs/sub2/
)
[2] => Array
(
[MenuItem] => Programs Sub3
[URL] => /programs/sub3/
)
)

菜单示例

Home    Programs
Programs Sub1
Programs Sub2
Programs Sub3

Answer 1

试试这个，

function loop($arr, $parent, &$result) {
$temp = array_filter($arr, function($t) use ($parent) {
return $t['Parent'] == $parent;
});
foreach ($temp as $t) {
$parent = $t['MenuItem'];
if (array_search($parent, array_column($arr, 'Parent')) !== FALSE) {
$x = &$result[$t['Parent']][];
$x = array_slice($t, 1);
loop($arr, $parent, $x);
}else{            
$result[$t['Parent']][] = array_slice($t, 1);
}
}
}
$arr = Array
(Array
(
'Parent' => 'top',
'MenuItem' => 'Home',
'URL' => '/',
),
Array(
'Parent' => 'top',
'MenuItem' => 'Programs',
'URL' => '/programs/',
),
Array(
'Parent' => 'Programs',
'MenuItem' => 'Programs Sub1',
'URL' => '/programs/sub1/',
),
Array(
'Parent' => 'Programs',
'MenuItem' => 'Programs Sub2',
'URL' => '/programs/sub2/',
),
Array(
'Parent' => 'Programs',
'MenuItem' => 'Programs Sub3',
'URL' => '/programs/sub3/',
),
Array(
'Parent' => 'Programs Sub2',
'MenuItem' => 'Programs Sub2 1',
'URL' => '/programs/sub2/1',
),
Array(
'Parent' => 'Programs Sub2',
'MenuItem' => 'Programs Sub2 2',
'URL' => '/programs/sub2/2',
)
);
$result = [];
$parent = $arr[0]['Parent'];
loop($arr, $parent, $result);
var_dump($result);

它适用于任何深度的菜单，loop() 是一个递归函数。