Normalize Persian and Arabic numbers to English in Laravel Middleware

NormalizerNumbers.php

<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Http\Response;

class NormalizeNumbersMiddleware
{
    /**
     * Handle an incoming request.
     *
     * @param Request $request
     * @param Closure $next
     * @return RedirectResponse|Response|mixed
     */
    public function handle(Request $request, Closure $next)
    {
        $array = $request->all();

        $request->merge($this->normalizeNumbers($array));

        return $next($request);
    }

    /**
     * Normalize numbers (with string type) recursively.
     *
     * @param array& $fields
     * return array
     */
    private function normalizeNumbers(array &$fields): array
    {
        foreach ($fields as $key => &$value) {
            if (is_array($value)) {
                $value = $this->normalizeNumbers($value);
            } elseif (!is_integer($value) && $this->isNumeric($value)) {
                $fields[$key] = $this->toEnglish($value);
            }
        }

        return $fields;
    }

    /**
     * Detect if string is a number (Persian, Arabic or English)
     *
     * @param $string
     * @return bool|int
     */
    private function isNumeric($string): bool|int
    {
        // Numbers between [۰ - ۹] (Persian) or [٩ - ٠] (Arabic) or [0 - 9]
        return preg_match("/^([\x{6F0}-\x{6F9}|\x{660}-\x{669}0-9])+$/iu", $string);
    }

    private function toEnglish($string): array|string
    {
        $numbers = array(
            '٠' => '0', '۰' => '0', '١' => '1', '۱' => '1', '٢' => '2',
            '۲' => '2', '٣' => '3', '۳' => '3', '٤' => '4', '۴' => '4',
            '٥' => '5', '۵' => '5', '٦' => '6', '۶' => '6', '٧' => '7',
            '۷' => '7', '٨' => '8', '۸' => '8', '٩' => '9', '۹' => '9'
        );

        return str_replace(array_keys($numbers), array_values($numbers), $string);
    }
}