Custom replacement for title injection
The phpbb_seo class handles de-accentuation for most of the occidental characters, but you could need to handle more cases for your project.
Starting from v0.6.0, we introduced a simple way to set up custom replacements.
This is useful for special characters not properly handled by default, such as Russian ones (Г => G), or to implement custom replacements such as $ => dollar.
It works with any string, but you MUST perform the edits with an UTF-8 (without BOM) capable text editor.
This is still done in phpbb_seo/includes/setup_phpbb_seo.php, and still before :

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      // Let's make sure that settings are consistent
      $this->check_config();

The principle is simple, you can set up your custom replacement by filling the phpbb_seo::url_replace array ($this->url_replace).
The pattern to use is :

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      $this->url_replace = array(
         'character(s) to find' => 'replacement to apply',
      );

EXAMPLE :

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      $this->url_replace = array(
         // Purely cosmetic replace
         '$' => 'dollar', '€' => 'euro',
         '\'s' => 's', // it's => its / mary's => marys ...
         // Language specific replace (German example)
         'ß' => 'ss',
         'Ä' => 'Ae', 'ä' => 'ae',
         'Ö' => 'Oe', 'ö' => 'oe',
         'Ü' => 'Ue', 'ü' => 'ue',
      );

Just make sure that the characters you may add are not already handled properly but the default replacements before you add some more.
Please note that English characters are already properly handled.

You can use this thread to discuss about your case and to share the code for specific languages.

I recently helped akon for Cyrillic char-set, so here is the replacement we put together, translated to the new way of doing it :
Open :

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phpbb_seo/includes/setup_phpbb_seo.php

Find :

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      // Let's make sure that settings are consistent
      $this->check_config();

Before add :

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      // Custom characters replacement for Cyrillic char-set
      $this->url_replace = array(
         'А' => 'A', 'а' => 'a',
         'Б' => 'B', 'б' => 'b',
         'В' => 'V', 'в' => 'v',
         'Г' => 'G', 'г' => 'g',
         'Д' => 'D', 'д' => 'd',
         'Е' => 'E', 'е' => 'e',
         'Ж' => 'J', 'ж' => 'j',
         'З' => 'Z', 'з' => 'z',
         'И' => 'I', 'и' => 'i',
         'Й' => 'Y', 'й' => 'y',
         'К' => 'K', 'к' => 'k',
         'Л' => 'L', 'л' => 'l',
         'М' => 'M', 'м' => 'm',
         'Н' => 'N', 'н' => 'n',
         'О' => 'O', 'о' => 'o',
         'П' => 'P', 'п' => 'p',
         'Р' => 'R', 'р' => 'r',
         'С' => 'S', 'с' => 's',
         'Т' => 'T', 'т' => 't',
         'У' => 'U', 'у' => 'u',
         'Ф' => 'F', 'ф' => 'f',
         'Х' => 'H', 'х' => 'h',
         'Ц' => 'C', 'ц' => 'c',
         'Ч' => 'CH', 'ч' => 'ch',
         'Ш' => 'SH', 'ш' => 'sh',
         'Щ' => 'SHT', 'щ' => 'sht',
         'Ъ' => 'A', 'ъ' => 'a',
         'Ь' => 'X', 'ь' => 'x',
         'Ю' => 'YU', 'ю' => 'yu',
         'Я' => 'YA','я' => 'ya',   
      );

can you help me with the Vietnamese charset. I use this but it doesn't work well.

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      // Custom characters replacement for Vietnamese char-set
         $this->url_replace = array(
            'Á' => 'A', 'á' => 'a',
            'À' => 'A', 'à' => 'a',
            'Ả' => 'A', 'ả' => 'a',
            'Ã' => 'A', 'ã' => 'a',
            'Ạ' => 'A', 'ạ' => 'a',
            'Â' => 'A', 'â' => 'a',
            'Ấ' => 'A', 'ấ' => 'a',
            'Ầ' => 'A', 'ầ' => 'a',
            'Ẩ' => 'A', 'ẩ' => 'a',
            'Ẫ' => 'A', 'ẫ' => 'a',
            'Ậ' => 'A', 'ậ' => 'a',
            'Ă' => 'A', 'ă' => 'a',
            'Ắ' => 'A', 'ắ' => 'a',
            'Ằ' => 'A', 'ằ' => 'a',
            'Ẳ' => 'A', 'ẳ' => 'a',
            'Ẵ' => 'A', 'ẵ' => 'a',
            'Ặ' => 'A', 'ặ' => 'a',
            
            'Đ' => 'D', 'đ' => 'd',
            
            'É' => 'E', 'é' => 'e',
            'È' => 'E', 'è' => 'e',
            'Ẻ' => 'E', 'ẻ' => 'e',
            'Ẽ' => 'E', 'ẽ' => 'e',
            'Ẹ' => 'E', 'ẹ' => 'e',
            'Ê' => 'E', 'ê' => 'e',
            'Ế' => 'E', 'ế' => 'e',
            'Ề' => 'E', 'ề' => 'e',
            'Ể' => 'E', 'ể' => 'e',
            'Ễ' => 'E', 'ễ' => 'e',
            'Ệ' => 'E', 'ệ' => 'e',
            
            'Í' => 'I', 'í' => 'i',
            'Ì' => 'I', 'ì' => 'i',
            'Ỉ' => 'I', 'ỉ' => 'i',
            'Ĩ' => 'I', 'ĩ' => 'i',
            'Ị' => 'i', 'ị' => 'i',
            
            'Ó' => 'O', 'ó' => 'o',
            'Ò' => 'O', 'ò' => 'o',
            'Ỏ' => 'O', 'ỏ' => 'o',
            'Õ' => 'O', 'õ' => 'o',
            'Ọ' => 'O', 'ọ' => 'o',
            'Ô' => 'O', 'ô' => 'o',
            'Ố' => 'O', 'ố' => 'o',
            'Ồ' => 'O', 'ồ' => 'o',
            'Ổ' => 'O', 'ổ' => 'o',
            'Ỗ' => 'O', 'ỗ' => 'o',
            'Ộ' => 'O', 'ộ' => 'o',
            'Ơ' => 'O', 'ơ' => 'o',
            'Ớ' => 'O', 'ớ' => 'o',
            'Ờ' => 'O', 'ờ' => 'o',
            'Ở' => 'O', 'ở' => 'o',
            'Ỡ' => 'O', 'ỡ' => 'o',
            'Ợ' => 'O', 'ợ' => 'o',
            
            'Ú' => 'U', 'ú' => 'u',
            'Ù' => 'U', 'ù' => 'u',
            'Ủ' => 'U', 'ủ' => 'u',
            'Ũ' => 'U', 'ũ' => 'u',
            'Ụ' => 'U', 'ụ' => 'u',
            'Ư' => 'U', 'ư' => 'u',
            'Ứ' => 'U', 'ứ' => 'u',
            'Ừ' => 'U', 'ừ' => 'u',
            'Ử' => 'U', 'ử' => 'u',
            'Ữ' => 'U', 'ữ' => 'u',
            'Ự' => 'U', 'ự' => 'u',
            
            'Ý' => 'Y', 'ý' => 'y',
            'Ỳ' => 'Y', 'ỳ' => 'y',
            'Ỷ' => 'Y', 'ỷ' => 'y',
            'Ỹ' => 'Ỹ', 'ỹ' => 'y',
            'Ỵ' => 'Y', 'ỵ' => 'y',
         );

E.g: it shows
thcsthanhda.info/forum/thong-bao/earth-hour-gi-trai-t-t-t-en-b-t-t-ng-lai-28-3-09-t239.html
for topic title Earth Hour -Giờ Trái đất: Tắt đèn để bật tương lai (28/3/09)

Sorry let me talk to him using native language

Có thể anh đang bật chế độ SQL rewriting. Cái method này chỉ có tác dụng khi tạo topic mới thôi, còn những topic cũ sẽ vẫn có link như thế vì nó lấy link từ cái URL chứ không phải từ title của topic. Nếu muốn sửa lại thì anh edit lại cái URL.

Hy vọng giúp được anh^^

Hopefully you helped him.

Just in case, if you implement these custom replacement after you've filled your db (with SQL rewriting and sync_url.php), then you need to a) clear the topic_url field and b) re sync your urls in both case with the sync_url.php script.

++

I got it. Thanks guys

So, these code change are the good ones for Vietnamese : Custom replacement for Vietnamese

Can you confirm, since I have no authority for that

++

I can confirm it works perfectly. However, we might want to change 'Ị' => 'i' into 'Ị' => 'I' to keep the unity.

Done

I don't use 3.0.5premod, iam now using 3.0.4 premod. How to edit with Vietnamese charset

You could follow the advices provided here about Cyrillic char-set and previous phpBB version : Setup and cyrillic char-set

Of course using the Vietnamese replacements.

But updating phpBB would still be the best thing to do

++

Hello, I am translating into Italian the gym sitemap, I wanted to ask if they are even special characters such as accented vowels à è ì ò ù, for the following post on this topic I have a problem on my index map indicates it is the only one that does not work . Moreover, the language file is language \ en \ common.php? Thank

à è ì ò ù characters are handled by the default replacements, there is no need to do anything for it. About your sitemap issue, it's off topic on this thread, and by the way looks like working great on your site.

About translating, have a look at the files added by GYM, as well as to the bit of code added to the phpBB language files.

language/en/gym_sitemaps/gym_common.php contain the publicly viewable language entries, others are used in acp.

++

Thank i have solved the problem was the special carachter &.

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      }
      // <== Special for lazy French, others may delete this part
      // Custom characters replacement for Cyrillic char-set
      $this->url_replace = array(
         'Ą' => 'A', 'ą' => 'a',
         'Č' => 'c', 'č' => 'c',
         'Ę' => 'e', 'ę' => 'e',
         'Ė' => 'e', 'ė' => 'e',
         'Į' => 'i', 'į' => 'i',
         'Š' => 's', 'š' => 's',
         'Ų' => 'u', 'ų' => 'u',
         'Ū' => 'u', 'ū' => 'u',
         'Ž' => 'z', 'ž' => 'z',
      
      // Let's make sure that settings are consistent
      $this->check_config();
   }
   // Here start the add-on methods
} // End of the phpbb_seo_modules class
?>

setup_phpbb_seo.php like this and error

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Parse error: syntax error, unexpected ';', expecting ')' in /home/algiz/domains/plepuciai.lt/public_html/phpbb_seo/includes/setup_phpbb_seo.php on line 102