问基于键数组的PHP从数组中获取值
EN

Stack Overflow用户

提问于 2021-02-03 05:46:46

回答 1查看 55关注 0票数 0

我试图在一个动态生成的多维数组中找到一个点，这个数组基于带键的数组。

基本上，我有以下数组：

$arr = [
    "something" => [
        'something_else' => [
            "another_thing" => "boo"
        ]
    ],
    "something2" => [
        'something_elseghf' => [
            "another_thingfg" => [
                "hi" => "bye"
            ]
        ]
    ],
    "info" => [
        'something_else2' => [
            "another_thingh" => "boo"
        ]
    ],
];

现在，我想根据不同数组中的键在数组中设置一个值：

$keyArr = ["something2", 'something_elseghf' "another_thingfg", "hi"];

因此，上面的数组意味着我需要将hi键设置为某个值。如何用这些随机键到达数组的那一部分，注意$keyArr的长度也是动态的。所以我够不着：

$arr[$keyArr[0]][$keyArr[1]][$keyArr[2]][$keyArr[3]] =

希望有人对如何解决这个问题有一个想法！

php

arrays

回答 1

Stack Overflow用户

回答已采纳

发布于 2021-02-03 05:53:47

试试这种方法：

$arr = [
    "something" => [
        'something_else' => [
            "another_thing" => "boo"
        ]
    ],
    "something2" => [
        'something_elseghf' => [
            "another_thingfg" => [
                "hi" => "bye"
            ]
        ]
    ],
    "info" => [
        'something_else2' => [
            "another_thingh" => "boo"
        ]
    ],
];

$keyArr = ["something2", 'something_elseghf', "another_thingfg", "hi"];


$cursor = $arr;
foreach ($keyArr as $key) {
    $cursor = $cursor[$key];
}

echo $cursor;

威尔回声

bye

更新：

如果要更改多维数组中的值，请使用递归函数，如下所示：

function changeValue($array, $path, $value) {
    if (empty($path)) {
        return $value;
    }
    $key = array_shift($path);
    $array[$key] = changeValue($array[$key], $path, $value);
    return $array;
}

$arr = [
    "something" => [
        'something_else' => [
            "another_thing" => "boo"
        ]
    ],
    "something2" => [
        'something_elseghf' => [
            "another_thingfg" => [
                "hi" => "bye"
            ]
        ]
    ],
    "info" => [
        'something_else2' => [
            "another_thingh" => "boo"
        ]
    ],
];

$keyArr = ["something2", 'something_elseghf', "another_thingfg", "hi"];

$changedArray = changeValue($arr, $keyArr, 'New value!');

print_r($changedArray);

威尔输出

Array
(
    [something] => Array
        (
            [something_else] => Array
                (
                    [another_thing] => boo
                )

        )

    [something2] => Array
        (
            [something_elseghf] => Array
                (
                    [another_thingfg] => Array
                        (
                            [hi] => New value!
                        )

                )

        )

    [info] => Array
        (
            [something_else2] => Array
   

         (
                [another_thingh] => boo
            )

    )
)