我有一个像这样的多维数组：
Array
(
[0] => Array
(
[id] => 14061
[subchannel] => Array
(
[0] => Array
(
[id] => 14144
[subchannel] => Array
(
[0] => Array
(
[id] => 14154
[subchannel] => Array
(
)
[name] => 14154name
)
[1] => Array
(
[id] => 14155
[subchannel] => Array
(
)
[name] => 14155name
)
[2] => Array
(
[id] => 14156
[subchannel] => Array
(
)
[name] => 14156name
)
)
[name] => 14144name
)
[1] => Array
(
[id] => 14145
[subchannel] => Array
(
[0] => Array
(
[id] => 14161
[subchannel] => Array
(
)
[name] => 14161name
)
[1] => Array
(
[id] => 14162
[subchannel] => Array
(
)
[name] => 14162name
)
[2] => Array
(
[id] => 14163
[subchannel] => Array
(
)
[name] => 14163name
)
)
[name] => 14145name
)
[2] => Array
(
[id] => 14146
[subchannel] => Array
(
[0] => Array
(
[id] => 14167
[subchannel] => Array
(
)
[name] => 14167name
)
[1] => Array
(
[id] => 14168
[subchannel] => Array
(
)
[name] => 14168name
)
[2] => Array
(
[id] => 14169
[subchannel] => Array
(
)
[name] => 14169name
)
)
[name] => 14146name
)
)
[name] => 14061name
)
[1] => Array
(
[id] => 14062
[subchannel] => Array
(
)
[name] => 14062name
)
[2] => Array
(
[id] => 14063
[subchannel] => Array
(
)
[name] => 14063name
)
)
我想将上面的多维数组更改为父子关系数组包含这个（pid表示parentid）：
[id=>14061,pid=>0,name=>14061name]
[id=>14062,pid=>0,name=>14062name]
[id=>14063,pid=>0,name=>14063name]
[id=>14144,pid=>14061,name=>14144name]
[id=>14145,pid=>14061,name=>14145name]
[id=>14146,pid=>14061,name=>14146name]
[id=>14154,pid=>14144,name=>14154name]
[id=>14155,pid=>14144,name=>14155name]
[id=>14156,pid=>14144,name=>14156name]
[id=>14161,pid=>14145,name=>14161name]
[id=>14162,pid=>14145,name=>14162name]
[id=>14163,pid=>14145,name=>14163name]
[id=>14167,pid=>14146,name=>14167name]
[id=>14168,pid=>14146,name=>14168name]
[id=>14169,pid=>14146,name=>14169name]
我使用了一个函数，但只是在$ this-＆gt; data中获取ID：
function arr_foreach ($arr)
{
if (!is_array ($arr))
{
return false;
}
foreach ($arr as $key => $val )
{
if (is_array ($val))
{
$this->arr_foreach ($val);
}
else
{
if($key == "id"){
$this->data[] = $val;
}
}
}
}
任何人都可以编写一个PHP代码来执行此操作吗？
答案 0 :(得分：1)
你发布的尝试已经非常好了。但是，我不会递归每个数组但总是跳过一个级别。
我的意思是什么？当你进入foreach()时，你将拥有一个结构数组
[
'id' => ..,
'subchannel' => ..,
'name' => ..
]
现在不是将整个数组提供给下一级递归，而是可以传递subchannel子数组。唯一剩下的就是了解父母的id。但这可以通过添加另一个参数并在递归传递当前id时轻松完成（因此它将是更深层元素的父元素）。
这将为您提供类似
的功能function flatten($array, $parent = NULL) {
if (!is_array($array) || empty($array))
return;
foreach ($array as $key=>$value) {
//something is wrong/incomplete
if (!is_array($value) || !isSet($value['id'], $value['subchannel'], $value['name']))
continue;
$this->flatten($value['subchannel'], $value['id']);
$this->data[] = array(
'id' => $value['id'],
'pid' => $parent,
'name' => $value['name']
);
}
}
您还会注意到我添加了条件empty($array)。由于这是在这里，在foreach()内不需要额外检查以查看元素是否实际上有子项 - 下一级递归将检查它并在必要时停止。