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Using unusual character sets

Some people have reported problems with Relevanssi and non-English characters, mostly accented letters. The problem here isn’t with Relevanssi, which handles UTF-8 characters without problems (if you’re not using Unicode, but some other character set, you may indeed be out of luck).

The issue lies with MySQL. If you’re having troubles, try switching the collation on the ‘term’ field in the Relevanssi main table (typically ‘wp_relevanssi’) to ‘utf8_general_ci’ (or some other utf8 collation that suits you better). Re-index, and things should work better.

30 comments Using unusual character sets

  1. Does this means that if I have a word like Mónica and I search Monica (withouth the accent) would Relevanssi will find it?

      1. Hi Mikko,

        For me that is not working… you can take a look at

        At the top you can see that there is a link called “Anúnciate”.

        If you search for “Anúnciate” you’ll get one result. But if you search for “Anunciate” you won’t get that page as a result.

        1. Well, Relevanssi doesn’t really do anything about this, it’s actually a MySQL feature, so it probably depends on your database settings (database column collation). It works on my blog, I have ‘latin1_swedish_ci’ collation. It works also with ‘utf8_general_ci’, so you could try that.

  2. According to phpMyAdmin is ‘utf8_general_ci’:

    — Table structure for table `wp_relevanssi`

    CREATE TABLE IF NOT EXISTS `wp_relevanssi` (
    `id` mediumint(9) NOT NULL AUTO_INCREMENT,
    `doc` bigint(20) NOT NULL,
    `term` varchar(50) NOT NULL,
    `tf` mediumint(9) NOT NULL,
    `title` tinyint(1) NOT NULL,
    UNIQUE KEY `id` (`id`),
    KEY `doc` (`doc`),
    KEY `term` (`term`)

    Any other ideas?

  3. Hi,

    The highlighting functionality doesn’t work with Hebrew characters. The relevant results are returned fine in Hebrew but unlike the ones in English, they are not highlighted for some reason. I modified the collation on the ‘term’ field but the problem remains. Any ideas?

    Many thanks,


    1. “Uncheck this if you use non-ASCII characters” – have you unchecked that option? If that doesn’t help, I don’t know what will. Probably a problem with how the highlighting regexp handles Hebrew characters. Unfortunately I don’t know how to fix that.

  4. hi, first of all good plugin which has solving us a lot of probs but know we have realized that because our site is in Spain=) indexing is not working propertly with the ñ and the accent letters. We have tryed to change in the wp_relevanssi table the term collate, but not working. Any idea how to fix it? should be the table complete ALTER instead of the field?.

    1. I once tried the whole Polish alphabet on my test blog and it worked fine. I just checked using ñ, and no problems. So, Relevanssi is Unicode compatible, but there’s something in your setup that isn’t… So try to meddle around in the MySQL collation settings, both on table and field level.

      1. finally it worked, there was sometihng weird when all data was massively added to the DB, so sorry my fault, the plug works perfectly with the ñ of España =).
        But now i am facing something weird too, i was using a faceted search and now it is not working any longer because two warning are being prompt in the implode function. any idea what could be changed in the search module?

  5. What kind of faceted search? What kind of implode errors? Relevanssi changes everything in the search module, there’s nothing left of original Relevanssi search =) So, if you’re using some other search plugin, yes, it’s most likely going to break down.

    1. jejej i supposed it, indexing everything should bring down the basic wp search module; it works, as i told you, perfect, but i am getting crazy trying to fix the new prob….
      Let me explain you how it worked just in case you had any idea (would be great) ; the search function sent to the old search module all the query to perform the post search, eg,
      function smart_query($effective_array)
      global $wpdb;
      $queryfrom = ‘FROM ‘.$wpdb->posts;
      $querywhere = ” WHERE post_type = ‘post’ AND post_status = ‘publish’ AND (“;
      $querywhere_array = array();

      //loop through all selected terms and build the ‘where’ query fragment corresponding to that term
      foreach ($effective_array as $id)
      $querywhere_array[$id] = ‘(ID in (SELECT tr’.$id.’.object_id FROM ‘.$wpdb->term_relationships.’ tr’.$id.’, ‘.$wpdb->term_taxonomy.’ tt’.$id.’ WHERE tt’.$id.’.term_id =’.$id.’ AND tr’.$id.’.term_taxonomy_id = tt’.$id.’.term_taxonomy_id)’;
      […..and keep constructing the query with the descendants, i wont post it in oreder not to make it imposible to read……]

      return ($query);
      }//function smart_query

      function facetedsearch_request_filter($input)
      if ( isset ($_REQUEST[‘strm’][0]) && isset($_REQUEST[‘facetedsearch’]) && $_REQUEST[‘facetedsearch’] == 1)
      return smart_query($input);//search with all categories selected
      else if ( isset ($_REQUEST[‘strm2’][0]) && isset($_REQUEST[‘facetedsearch’]) && $_REQUEST[‘facetedsearch’] == 2)
      return search_tags($input);
      } //function facetedsearch_request_filter

      add_filter(‘posts_request’,’facetedsearch_request_filter’);//add the filter

      And it is weird because results are becomen from the DB, (i know cuz i have a header slider and it is being updated (!????) with the post which accomplish the query).
      And also the warning messages:
      Warning: array_keys() [function.array-keys]: The first argument should be an array in /var/www/kk2/wp-content/plugins/role-scoper/relevanssi-helper-front_rs.php on line 31

      Warning: implode() [function.implode]: Invalid arguments passed in /var/www/kk2/wp-content/plugins/role-scoper/relevanssi-helper-front_rs.php on line 31

      As i said thanks for your help.

    1. I though t it but check what is in the function, supposed to be role-scoper =)
      valid_stati = array_merge( get_post_stati( array( ‘public’ => true ) ), get_post_stati( array( ‘private’ => true ) ) );

      remove_filter( ‘relevanssi_post_ok’, ‘relevanssi_default_post_ok’ );
      add_filter( ‘relevanssi_post_ok’, array( &$this, ‘relevanssi_post_ok’ ) );
      add_filter( ‘relevanssi_results’, array( &$this, ‘relevanssi_log_results’ ) );

      function relevanssi_log_results( $arr ) {

      //echo “Array qk le llegaa”.$arr; die();

      $this->relevanssi_results = $arr;

      global $wpdb;

      $id_clause = “AND ID IN( ‘” . implode( “‘,'”, array_keys($arr) ) . “‘)”;
      $results = $wpdb->get_results( “SELECT ID, post_name, post_type, post_status, post_author, post_parent FROM $wpdb->posts WHERE 1=1 $id_clause” );

      foreach( $results as $row ) {
      wp_cache_add( $row->ID, $row, ‘posts’ );

      return $arr;

      function relevanssi_post_ok($doc) {
      static $set_listed_ids = false;

      if ( ! $set_listed_ids ) {
      $set_listed_ids = true;
      $GLOBALS[‘scoper’]->listed_ids[‘post’] = array_fill_keys( array_keys($this->relevanssi_results), true );

      if ( function_exists(‘relevanssi_s2member_level’) ) {
      if ( relevanssi_s2member_level($doc) == 0 ) return false; // back compat with relevanssi_default_post_ok, in case somebody is also running s2member

      $status = relevanssi_get_post_status($doc);

      if ( in_array( $status, $this->valid_stati ) )
      $post_ok = current_user_can( ‘read_post’, $doc );
      $post_ok = false;

      return $post_ok;

  6. Dont tell me that :_( jeje
    i am trying to understand why performing the query, the results (even paged) are showed in an slider i have in the header (i have to select which ones to show) instead of showing them in the “normal” way, just in the body, and getting the results as 0 found.

  7. i have tryed the site unistalling the relevanssi and faceted search works again. could it be something with the form submit and how your plug works?? cuz i have checked whne i am clicking a search button, a lot of fields are sent.

  8. this is what the submit sent.

  9. Hello,

    When I’m using my site logged in, the search engine finds and highlights words with accentuated characters (like décision). Works fine.

    However, if I use the site as any normal visitor would (not logged in) words with accentuated characters (like décision), the results are nil. Broken.

    Any ideas?


  10. Hi, I am trying to make relevanssi find the term “A+++” in my product descriptions but no luck. Anybody knows a workaround for this? Thanx, mia

  11. Hi,
    In my WP MySQL database, the collation on the ‘term’, ‘term_reverse’, ‘taxonomy_detail’, ‘customfield_detail’ and ‘mysqlcolumn_detail’ fields in the Relevanssi main table ( ‘ck_relevanssi’) is already ‘utf8_general_ci’. Yet, Relevanssi still can’t find any terms in Spanish characters such as “Niña” or “Mínima”. Could I have missed something?

    1. Benoît, might be something in your database setup? I just tried this, and when I add those words to a post, I can find them both way: “Niña” or “Nina”, “Mínima” or “Minima”. That’s the way MySQL databases usually handle this. My database table is set to utf8mb4_unicode_520_ci though, don’t know if that makes a difference or not.

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