php嵌套数组unset元素与键

Question

我需要从每个数组中取消设置[device_id]元素。 我尝试了递归。但我无法做到这一点。任何人都可以为此提供帮助。我试过这样的。

foreach($tree as $key) {
    foreach($key as $value => $k){
        if ($value == 'device_id'){
            unset($k['device_id']);
        }
    }   
}

我有嵌套的多维数组，如下所示：

Array
(
    [4] => Array
        (
            [device_id] => 4
            [device_parent_id] => 2
            [device_ext] => 20122
            [device_name] => section controller1
            [username] => sectioncontroller1
            [password] => 90714771f0abd448f208e1aff5b662fc
            [device_macaddress] => 
            [device_ip] => 
            [device_desc] => 
            [admin_id] => 2
            [children] => Array
                (
                    [5] => Array
                        (
                            [device_id] => 5
                            [device_parent_id] => 4
                            [device_ext] => 20199
                            [device_name] => Emergency1
                            [username] => Emergency1
                            [password] => bb75df6eb4fdbf5753640a34674ecce1
                            [device_macaddress] => 
                            [device_ip] => 
                            [device_desc] => 
                            [admin_id] => 2
                            [children] => Array
                                (
                                )
                        )
                    [6] => Array
                        (
                            [device_id] => 6
                            [device_parent_id] => 4
                            [device_ext] => 20111
                            [device_name] => HQ Phone
                            [username] => HQPhone
                            [password] => 2f89d97f24539dc50ddd8fc53667b194
                            [device_macaddress] => 
                            [device_ip] => 
                            [device_desc] => 
                            [admin_id] => 2
                            [children] => Array
                                (
                                )
                        )
                    [9] => Array
                        (
                            [device_id] => 9
                            [device_parent_id] => 4
                            [device_ext] => 20144
                            [device_name] => Other controller1
                            [username] => Othercontroller1
                            [password] => 861426b485e2afd62ad0d914f524f23c
                            [device_macaddress] => 
                            [device_ip] => 
                            [device_desc] => 
                            [admin_id] => 2
                            [children] => Array
                                (
                                    [10] => Array
                                        (
                                            [device_id] => 10
                                            [device_parent_id] => 9
                                            [device_ext] => 30122
                                            [device_name] => Way Station1
                                            [username] => WayStation1
                                            [password] => 085d397b0392d3a325216a716c757113
                                            [device_macaddress] => 
                                            [device_ip] => 
                                            [device_desc] => 
                                            [admin_id] => 2
                                            [children] => Array
                                                (
                                                )
                                        )
                                )
                        )
                )
        )

    [21] => Array
        (
            [device_id] => 21
            [device_parent_id] => 2
            [device_ext] => 1123299
            [device_name] => sectioncontroller99
            [username] => sectioncontroller3
            [password] => 73d25d443117f76c6fe6bd5a4679f458
            [device_macaddress] => 124511251419
            [device_ip] => 124.235.63.569
            [device_desc] => test section9
            [admin_id] => 0
            [children] => Array
                (
                    [22] => Array
                        (
                            [device_id] => 22
                            [device_parent_id] => 21
                            [device_ext] => 9999
                            [device_name] => emergancy
                            [username] => emergancy
                            [password] => c2bc24d3d41ad9ade0171c3d5d6f59c6
                            [device_macaddress] => 1245122
                            [device_ip] => 124.235.235
                            [device_desc] => sdfdf sdfsdf sdfsd
                            [admin_id] => 0
                            [children] => Array
                                (
                                )
                        )
                )
        )
);

Answer 1

你需要一个递归函数。这应该有效：

function deleteDeviceId(&$tree) {
    foreach ($tree as $k => &$item) {
        unset($item['device_id']);
        deleteDeviceId($item['children']);
    }
}

deleteDeviceId($tree);

Answer 2

问题是循环中的变量是独立变量，更改它们不会影响原始数组。

要解决这个问题，你可以：

• 使用$tree中的完整路径直接取消设置变量：
  unset($tree[$outer_key][$inner_key]);。你也需要在外循环中使用密钥。
  请注意，你似乎在foreach循环中使用了密钥和值，但这只是名字......
• 通过引用传递循环变量;当他们引用原始变量时，任何变化都将是原始变量的变化。