如何在php中查找多维数组中的指针？

function searchArrayPointer($needle, $haystack) {
    foreach ($haystack as $key => $value) {
        if ($value === $needle) {
            return $key;
        }
        if (is_array($value)) {
            $result = searchArrayPointer($needle, $value);
            if ($result !== false) {
                return $key . '.' . $result;
            }
        }
    }
    return false;
}

$multiDimensionalArray = array(
    'key1' => 'value1',
    'key2' => array(
        'subkey1' => 'subvalue1',
        'subkey2' => 'subvalue2',
        'subkey3' => array(
            'subsubkey1' => 'subsubvalue1',
            'subsubkey2' => 'subsubvalue2'
        )
    ),
    'key3' => 'value3'
);

$searchValue = 'subsubvalue2';
$pointer = searchArrayPointer($searchValue, $multiDimensionalArray);

if ($pointer !== false) {
    echo "The pointer to '{$searchValue}' is '{$pointer}'.";
} else {
    echo "The value '{$searchValue}' was not found in the array.";
}