PHP array_filter_recursive helper

array_filter_recursive.php

<?php declare(strict_types=1);

if (!function_exists('array_filter_recursive')) {
    /**
     * @param array $array
     * @param ?callable $callback = null
     *
     * @return array
     */
    function array_filter_recursive(array $array, ?callable $callback = null): array
    {
        if ($callback === null) {
            $callback = static function ($value) {
                return $value;
            };
        }

        return array_filter(array_map(static function ($value) use ($callback) {
            return is_array($value) ? array_filter_recursive($value, $callback) : $value;
        }, $array), $callback);
    }
}