相交的多维键

Question

Say I have two arrays:

$array1

Array
(
    [app] => Array
        (
            [name] => PunchClock
            [shifts] => Array
                (
                    [maxhours] => 16
                    [minhours] => 4
                )

            [con] => Array
                (
                    [moog] => 3
                )

        )

)

and $array2

Array
(
    [app] => Array
        (
            [name] => 
        )

)

I'm trying to find a way use the second array in order to get its corresponding value coming from the first array. For example, if I were to call:

$value = $array2['app']['name']

The corresponding value would be PunchClock. If I were to choose $array2['app']['shifts'], the corresponding value would return an array containing maxhours and minhours. I've tried intersecting the arrays but not getting anywhere. I've running this in recursion but it's getting quite messy. I don't know what other options to use at this point. Any help would be appreciated.

Answer 1

function array_intersect_keys_recursive($a, $b)
{
    $r = array();
    foreach ($a as $k => $v)
    {
        if (is_array($a[$k]) && isset($b[$k]) && is_array($b[$k]))
        {
            $r[$k] = array_intersect_keys_recursive($a[$k], $b[$k]);
            continue;
        }
        if (isset($a[$k]) && isset($b[$k]))
        {
            $r[$k] = $a[$k];
        }
    }
    return $r;
}

$a = Array
(
    'app' => Array
        (
            'name' => 'PunchClock',
            'shifts' => Array
                (
                    'maxhours' => 16,
                    'minhours' => 4
                ),

            'con' => Array
                (
                    'moog' => 3
                )

        )

);

$b = Array
(
    'app' => Array
        (
            'name' => ''
        )
);


$c = array_intersect_keys_recursive($a, $b);

print_r($c);

The above example will output:

Array
(
    [app] => Array
        (
            [name] => PunchClock
        )

)