Listener.php

<?php

namespace Xfrocks\VietnameseFriendlyLink;

use XF\App;
use XF\Container;
use XF\Mvc\Router;

class Listener
{
    /**
     * @param App $app
     * @return void
     * @see utf8_deaccent
     * @see utf8_romanize
     */
    public static function appSetup($app)
    {
        if (!self::$doneIt) {
            self::doIt();
            self::$doneIt = true;
        }
    }

    /**
     * @param Container $container
     * @param Router $router
     * @return void
     * @see \XF\Mvc\Router::prepareStringForUrl()
     */
    public static function routerPublicSetup($container, &$router)
    {
        $router->setRomanizeUrls(true);
    }

    /**
     * @var bool
     */
    private static $doneIt = false;

    /**
     * @return void
     */
    private static function doIt()
    {
        global $UTF8_LOWER_ACCENTS, $UTF8_UPPER_ACCENTS, $UTF8_ROMANIZATION;

        $UTF8_LOWER_ACCENTS += [
            'à' => 'a',
            'á' => 'a',
            'ạ' => 'a',
            'ả' => 'a',
            'ã' => 'a',
            'â' => 'a',
            'ầ' => 'a',
            'ấ' => 'a',
            'ậ' => 'a',
            'ẩ' => 'a',
            'ẫ' => 'a',
            'ă' => 'a',
            'ằ' => 'a',
            'ắ' => 'a',
            'ặ' => 'a',
            'ẳ' => 'a',
            'ẵ' => 'a',
            'è' => 'e',
            'é' => 'e',
            'ẹ' => 'e',
            'ẻ' => 'e',
            'ẽ' => 'e',
            'ê' => 'e',
            'ề' => 'e',
            'ế' => 'e',
            'ệ' => 'e',
            'ể' => 'e',
            'ễ' => 'e',
            'ì' => 'i',
            'í' => 'i',
            'ị' => 'i',
            'ỉ' => 'i',
            'ĩ' => 'i',
            'ò' => 'o',
            'ó' => 'o',
            'ọ' => 'o',
            'ỏ' => 'o',
            'õ' => 'o',
            'ô' => 'o',
            'ồ' => 'o',
            'ố' => 'o',
            'ộ' => 'o',
            'ổ' => 'o',
            'ỗ' => 'o',
            'ơ' => 'o',
            'ờ' => 'o',
            'ớ' => 'o',
            'ợ' => 'o',
            'ở' => 'o',
            'ỡ' => 'o',
            'ù' => 'u',
            'ú' => 'u',
            'ụ' => 'u',
            'ủ' => 'u',
            'ũ' => 'u',
            'ư' => 'u',
            'ừ' => 'u',
            'ứ' => 'u',
            'ự' => 'u',
            'ử' => 'u',
            'ữ' => 'u',
            'ỳ' => 'y',
            'ý' => 'y',
            'ỵ' => 'y',
            'ỷ' => 'y',
            'ỹ' => 'y',
            'đ' => 'd',
        ];

        $UTF8_UPPER_ACCENTS += [
            'À' => 'A',
            'Á' => 'A',
            'Ạ' => 'A',
            'Ả' => 'A',
            'Ã' => 'A',
            'Â' => 'A',
            'Ầ' => 'A',
            'Ấ' => 'A',
            'Ậ' => 'A',
            'Ẩ' => 'A',
            'Ẫ' => 'A',
            'Ă' => 'A',
            'Ằ' => 'A',
            'Ắ' => 'A',
            'Ặ' => 'A',
            'Ẳ' => 'A',
            'Ẵ' => 'A',
            'È' => 'E',
            'É' => 'E',
            'Ẹ' => 'E',
            'Ẻ' => 'E',
            'Ẽ' => 'E',
            'Ê' => 'E',
            'Ề' => 'E',
            'Ế' => 'E',
            'Ệ' => 'E',
            'Ể' => 'E',
            'Ễ' => 'E',
            'Ì' => 'I',
            'Í' => 'I',
            'Ị' => 'I',
            'Ỉ' => 'I',
            'Ĩ' => 'I',
            'Ò' => 'O',
            'Ó' => 'O',
            'Ọ' => 'O',
            'Ỏ' => 'O',
            'Õ' => 'O',
            'Ô' => 'O',
            'Ồ' => 'O',
            'Ố' => 'O',
            'Ộ' => 'O',
            'Ổ' => 'O',
            'Ỗ' => 'O',
            'Ơ' => 'O',
            'Ờ' => 'O',
            'Ớ' => 'O',
            'Ợ' => 'O',
            'Ở' => 'O',
            'Ỡ' => 'O',
            'Ù' => 'U',
            'Ú' => 'U',
            'Ụ' => 'U',
            'Ủ' => 'U',
            'Ũ' => 'U',
            'Ư' => 'U',
            'Ừ' => 'U',
            'Ứ' => 'U',
            'Ự' => 'U',
            'Ử' => 'U',
            'Ữ' => 'U',
            'Ỳ' => 'Y',
            'Ý' => 'Y',
            'Ỵ' => 'Y',
            'Ỷ' => 'Y',
            'Ỹ' => 'Y',
            'Đ' => 'D',
        ];

        $UTF8_ROMANIZATION += [
            '̉' => '',
            '̣' => '',
            '̃' => '',
            '̀' => '',
            '́' => '',
            '🇻🇳' => 'vn',
        ];
    }
}