在PHP的嵌套关联数组中搜索值并返回其路径 [英] Searching for a value and returning its path in a nested associative array in PHP

问题描述

我正在尝试在PHP的嵌套关联数组中搜索值，类似于array_search但嵌套.我需要所有导致该特定值的键.

I'm trying to search for a value in a nested associative array in PHP, much like array_search but nested. I need all the keys leading to that particular value.

我在SO上没有看到任何要求该特定功能的帮助的内容，所以现在我要问.其他示例似乎返回数组中的所有值，而不仅仅是返回单个键/值对的路径.

I didn't see anything on SO asking for help with this specific function, so now I am asking. Other examples seem to return all values in an array, not just the path to a single key/value pair.

推荐答案

function array_search_path($needle, array $haystack, array $path = []) {
    foreach ($haystack as $key => $value) {
        $currentPath = array_merge($path, [$key]);
        if (is_array($value) && $result = array_search_path($needle, $value, $currentPath)) {
            return $result;
        } else if ($value === $needle) {
            return $currentPath;
        }
    }
    return false;
}

$arr = [
    'foo' => 'bar',
    'baz' => [
        'test' => 42,
        'here' => [
            'is' => [
                'the' => 'path'
            ]
        ],
        'wrong' => 'turn'
    ]
];

print_r(array_search_path('path', $arr));

// Array
// (
//    [0] => baz
//    [1] => here
//    [2] => is
//    [3] => the
// )

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