搜索在数组中的键，递归 [英] Search for a key in an array, recursively

问题描述

private function find($needle, $haystack) {
    foreach ($haystack as $name => $file) {
        if ($needle == $name) {
            return $file;
        } else if(is_array($file)) { //is folder
            return $this->find($needle, $file); //file is the new haystack
        }               
    }

    return "did not find";
}

哎，该方法搜索在关联数组的特定键，并返回与它相关联的值。这里也有一些问题的递归。任何线索？

Hey, this method searches for a specific key in an associative array and returns the value associated with it. There's some problem with the recursion. Any clue?

推荐答案

也许是矫枉过正，但它很有趣地使用RecursiveIterators：）

Maybe it's overkill, but it's funny to use RecursiveIterators :)

function recursiveFind(array $array, $needle)
{
    $iterator  = new RecursiveArrayIterator($array);
    $recursive = new RecursiveIteratorIterator(
        $iterator,
        RecursiveIteratorIterator::SELF_FIRST
    );
    foreach ($recursive as $key => $value) {
        if ($key === $needle) {
            return $value;
        }
    }
}

这篇关于搜索在数组中的键，递归的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！