Joomla, wordpress are support unicode in seo url, why not in phpbb seo?

Because from our experience, not all browser will handle that properly, and utf-8 urlencoded urls can end up being very very long.

You can though tweak the phpbb_seo::format_url method (in phpbb_seo_class.php) to just use the title without formatting it (or with very little formatting, like getting rid of spaces), you'll have all chars included in urls this way, but I would not recommend it.
It would additionally require to tweak all rewriterules, replacing the [a-z0-9_-] with . (a dot).

++

I tried to use cyrillic letters with seo-mod 0.6.4 and phpbb3 3.0.7-pl1 on nginx/0.7.64:

I changed in phpbb_seo_class.php
this line

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$this->RegEx['url_find'] = array('`&([a-z]+)(acute|grave|circ|cedil|tilde|uml|lig|ring|caron|slash);`i', '`&(amp;)?[^;]+;`i', '`[^a-z0-9]`i');

to this

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$this->RegEx['url_find'] = array('`&([a-zа-я]+)(acute|grave|circ|cedil|tilde|uml|lig|ring|caron|slash);`i', '`&(amp;)?[^;]+;`i', '`[^a-zа-я0-9]`i');

and added also to the rewrite rules in .htaccess "а-я".
In the end I get urls like that:
"%D0-%D1-%D0%BD%D0%BE%D0%BA"
and that:
"�-�-нок-�-ел�-�"
So I certainly have to change this part of
phpbb_seo_class.php

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   function seo_url_encode( $url ) {
      // can be faster to return $url directly if you do not allow more chars than
      // [a-zA-Z0-9_\.-] in your usernames
      // return $url;
      // Here we handle the "&", "/", "+" and "#" case proper ( http://www.php.net/urlencode => http://issues.apache.org/bugzilla/show_bug.cgi?id=34602 )
      static $find = array('&', '/', '#', '+');
      static $replace = array('%26', '%2F', '%23', '%2b');
      return rawurlencode(str_replace( $find, $replace, utf8_normalize_nfc(htmlspecialchars_decode(str_replace('&', '%26', rawurldecode($url))))));
   }

If it is right: Where to get the proper codes for cyrillic letters?
If not: What can I else do to get proper cyrillic links ?

I found a solution:
Instead of using "a-я" I had to use "\x7f-\xff"

Code: Select all

    $this->RegEx['url_find'] = array('`&([a-z\x7f-\xff]+)(acute|grave|circ|cedil|tilde|uml|lig|ring|caron|slash);`i', '`&(amp;)?[^;]+;`i', '`[^a-z\x7f-\xff0-9]`i');

and the same for .htaccess ...

it works here with chrome, IE, FF, Safari and Opera under Linux and Windows ....