array_key_exists不工作 [英] array_key_exists is not working

问题描述

array_key_exists不工作对于大型多维数组。对于前

array_key_exists is not working for large multidimensional array. For ex

$arr = array(
    '1' => 10,
    '2' => array(
        '21' => 21,
        '22' => 22,
        '23' => array(
            'test' => 100,
            '231' => 231
        ),
    ),
    '3' => 30,
    '4' => 40
);

array_key_exists（'测试'，$ ARR）返回假，但它与一些简单数组的作品。

array_key_exists('test',$arr) returns 'false' but it works with some simple arrays.

推荐答案

array_key_exists不工作递归（如<一个href=\"http://stackoverflow.com/questions/2948948/array-key-exists-is-not-working#comment3005438_2948948\">Matti Virkkunen 已经指出的那样）。看看PHP手册，有以下件code的你可以用它来执行递归搜索：

array_key_exists does NOT work recursive (as Matti Virkkunen already pointed out). Have a look at the PHP manual, there is the following piece of code you can use to perform a recursive search:

<?php
function array_key_exists_r($needle, $haystack)
{
    $result = array_key_exists($needle, $haystack);
    if ($result) return $result;
    foreach ($haystack as $v) {
        if (is_array($v)) {
            $result = array_key_exists_r($needle, $v);
        }
        if ($result) return $result;
    }
    return $result;
}

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