php删除多维数组里面的值

在手册里面发现，改造后变成了一个函数，可以删除复杂的多维数组里面的制定键值对！

<?php
$arr = [
    "test" => "value",
    "level_one" => [
        "level_two" => [
            "level_three" => [
                "replace_this_array" => [
                    "special_key" => "replacement_value",
                    "key_one" => "testing",
                    "key_two" => "value",
                    "four" => "another value",
                ],
            ],
            "ordinary_key" => "value",
        ],
    ],
];

$unset = array("special_key", "ordinary_key", "four");
echo "<pre>";
print_r(unsetMultiKeys($unset, $arr));
print_r($arr);
echo "</pre>";
exit;

function unsetMultiKeys($unset, $array) {
    $arrayIterator = new RecursiveArrayIterator($array);
    $recursiveIterator = new RecursiveIteratorIterator($arrayIterator, RecursiveIteratorIterator::SELF_FIRST);
    foreach ($recursiveIterator as $key => $value) {
        foreach ($unset as $v) {
            if (is_array($value) && array_key_exists($v, $value)) {
                // 删除不要的值
                unset($value[$v]);
                // Get the current depth and traverse back up the tree, saving the modifications
                $currentDepth = $recursiveIterator->getDepth();
                for ($subDepth = $currentDepth; $subDepth >= 0; $subDepth--) {
                    // Get the current level iterator
                    $subIterator = $recursiveIterator->getSubIterator($subDepth);
                    // If we are on the level we want to change, use the replacements ($value) other wise set the key to the parent iterators value
                    $subIterator->offsetSet($subIterator->key(), ($subDepth === $currentDepth ? $value : $recursiveIterator->getSubIterator(($subDepth + 1))->getArrayCopy()));
                }
            }
        }
    }
    return $recursiveIterator->getArrayCopy();
}

运行结果：

改变多维数组里面的键值对