PHP helper to recursive iterate over an array. Method will send `$value` and `$key` to callback. `$values_only` option allow to send only final values to callback.

arrayMapRecursive.php

<?php declare(strict_types=1);

/**
 * @param array $array
 * @param callable $callback
 * @param bool $values_only = true
 *
 * @return array
 */
public function arrayMapRecursive(array $array, callable $callback, bool $values_only = true): array
{
    $map = function ($value, $key) use ($callback, $values_only) {
        if (is_array($value) === false) {
            return $callback($value, $key);
        }

        if ($values_only) {
            return $this->arrayMapRecursive($value, $callback, $values_only);
        }

        return $this->arrayMapRecursive($callback($value, $key), $callback, $values_only);
    };

    return array_combine($keys = array_keys($array), array_map($map, $array, $keys));
}