PHP - 查找数组父键 [英] PHP - Find parent key of array

问题描述

我试图找到一种方法返回一个数组的父键的值。

例如，从阵列下面我想找出母公司的关键，其中$数组['身份证'] ==0002。
父关键是显而易见的，因为它是这里定义（这将是产品），但通常它会是动态的，因此这个问题。在'ID'和'身份证'的价值，虽然已知的。

  [0] =＆GT;排列
        （
            [数据] =＆GT;
            [ID] =＆GT; 0000
            [名] =＆GT;漩涡
            [类别] =＆GT;排列
                （
                    [0] =＆GT;排列
                        （
                            [ID] =＆GT; 0001
                            [名] =＆GT;旋转
                            [产品] =＆GT;排列
                               （
                                    [0] =＆GT;排列
                                        （
                                            [ID] =＆GT; 0002
                                            [文件名] =＆GT; 1.JPG
                                         ）
                                    [1] =＆GT;排列
                                        （
                                            [ID] =＆GT; 0003
                                            [文件名] =＆GT; 2.JPG
                                         ）
                                ）
                         ）
                 ）
          ）
 

解决方案

一个有点粗糙递归，但它应该工作：

 函数find_parent（$数组，$针，$父= NULL）{
    的foreach（$数组$关键=＆GT; $值）{
        如果（is_array（$值））{
            $传球= $父母;
            如果（IS_STRING（$键））{
                $传球= $关键;
            }
            $发现= find_parent（价值$，$针，$通行证）;
            如果（$找到了！== FALSE）{
                返回$找到;
            }
        }否则如果（$关键==='ID'和;＆安培; $值$ ===针）{
            返回$父母;
        }
    }    返回false;
}$ parentkey = find_parent（$阵列，'0002'）;
 

I'm trying to find a way to return the value of an array's parent key.

For example, from the array below I'd like to find out the parent's key where $array['id'] == "0002". The parent key is obvious because it's defined here (it would be 'products'), but normally it'd be dynamic, hence the problem. The 'id' and value of 'id' is known though.

    [0] => Array
        (
            [data] => 
            [id] => 0000
            [name] => Swirl
            [categories] => Array
                (
                    [0] => Array
                        (
                            [id] => 0001
                            [name] => Whirl
                            [products] => Array 
                               (
                                    [0] => Array
                                        (
                                            [id] => 0002
                                            [filename] => 1.jpg
                                         )
                                    [1] => Array
                                        (
                                            [id] => 0003
                                            [filename] => 2.jpg
                                         )
                                )
                         )
                 )
          )

解决方案

A little crude recursion, but it should work:

function find_parent($array, $needle, $parent = null) {
    foreach ($array as $key => $value) {
        if (is_array($value)) {
            $pass = $parent;
            if (is_string($key)) {
                $pass = $key;
            }
            $found = find_parent($value, $needle, $pass);
            if ($found !== false) {
                return $found;
            }
        } else if ($key === 'id' && $value === $needle) {
            return $parent;
        }
    }

    return false;
}

$parentkey = find_parent($array, '0002');

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