使用另一个数组中的键搜索数组值

我有两个结构几乎相同的数组。

第一个数组是$_POST数据，而第二个数组包含正则表达式规则和其他一些用于数据验证的东西。

例：

$data = array(
    'name' => 'John Doe',
    'address' => array(
        'city' => 'Somewhere far beyond'
    )
);
$structure = array(
    'address' => array(
        'city' => array(
             'regex' => 'someregex'
         )
     )
 );

现在我想检查一下

$data['address']['city'] with $structure['address']['city']['regex'] 

或

$data['foo']['bar']['baz']['xyz']  with $structure['foo']['bar']['baz']['xyz']['regex']

任何想法如何使用PHP函数实现这一点？

---

编辑：似乎我自己找到了解决方案。

$data = array(
    'name' => 'John Doe',
    'address' => array(
        'city' => 'Somewhere far beyond'
    ),
    'mail' => 'test@test.tld'
);
$structure = array(
    'address' => array(
        'city' => array(
            'regex' => 'some_city_regex1',
        )
    ),
    'mail' => array(
        'regex' => 'some_mail_regex1',
    )
);
function getRegex($data, $structure)
{
    $return = false;
    foreach ($data as $key => $value) {
        if (empty($structure[$key])) {
            continue;
        }
        if (is_array($value) && is_array($structure[$key])) {
            getRegex($value, $structure[$key]);
        }
        else {
            if (! empty($structure[$key]['regex'])) {
                echo sprintf('Key "%s" with value "%s" will be checked with regex "%s"', $key, $value, $structure[$key]['regex']) . '<br>';
            }
        }
    }
    return $return;
}
getRegex($data, $structure);

$data = array(
    'name' => 'John Doe',
    'address' => array(
        'city' => 'Somewhere far beyond'
    ),
    'foo' => array(
        'bar' => array(
            'baz' => array(
                'xyz' => 'hij'
            )
        )
    )
);
$structure = array(
    'address' => array(
        'city' => array(
             'regex' => '[a-Z]'
         )
    ),
    'foo' => array(
        'bar' => array(
            'baz' => array(
                'xyz' => array(
                    'regex' => '[0-9]+'
                )
            )
        )
    )
 );

function validate ($data, $structure, &$validated) {
    if (is_array($data)) {
        foreach ($data as $key => &$value) {
            if (
                array_key_exists($key, $structure)
                and is_array($structure[$key])
            ) {             
                if (array_key_exists('regex', $structure[$key])) {
                    if (!preg_match($structure[$key]['regex'])) {
                        $validated = false;
                    }
                }
                validate($value, $structure[$key], $validated);
            }
        }
    }   
}

$validated = true;
validate($data, $structure, $validated);
if ($validated) {
    echo 'everything validates!';
}
else {
    echo 'validation error';
}