Support » Plugin: Search Unleashed » Add Categories filter to Search Unleashed

  • Resolved Renuplex


    I am posting this trick to add category filtering to Search Unleashed for the MySQL fulltext search since after looking all over the place I couldn’t find it and then decided to dig into the code and implement it myself.
    Turns out it’s really easy to add and I believe quite useful.

    The goal:
    If the search provides a cat=1,2,3 argument along with the search terms, then the engine only returns posts where the search terms were found AND belonging to ANY of the categories 1, 2 OR 3.

    If the search URL is:,2
    Then it should display posts where “wordpress” was found (according to the standard Search Unleashed search) AND that were tagged with categories 1 OR 2.

    An important note:
    This hack was implemented and works on wordpress 2.7.1. It is highly dependent on the WP database schema so it might not work on other versions. After searching a bit, it seems that the schema (at least regarding posts and categories relationships) has not changed in WP3, so this should be up-to-date.
    However if understood, it should be easy to adapt it for another schema.

    The hack now:
    In plugins/search-unleashed/mysql.php:

    Add the following lines :

    global $wp_query;
     $cats = $wp_query->get('cat');
        $sql .= " LEFT JOIN wp_term_relationships ON wp_posts.ID = wp_term_relationships.object_id ";

    BEFORE line
    $sql .= " WHERE 1=1 "

    Then, add the following lines:

     $sql .= " AND wp_term_relationships.term_taxonomy_id IN ($cats) ";

    AFTER line
    $sql .= " WHERE 1=1 "

    That’s it! Hope this will be usefull to some people!


Viewing 2 replies - 1 through 2 (of 2 total)
  • Hi, Could anyone advise as to how I send data from a form containing multiple dropdowns as cat=1,2,3,4 etc

    So, I require a form which has say 4 dropdowns selecting 4 seperate categories, when selected I want the form to send cat=1,2,3,4. I have the backend working its just getting the form to send the data in the correct form.

    At the moment it sends: – i would want this to read s=searchterm&cat=1,2,3,4

    Thank you very much for any help anyone can offer.
    Regards, Liam

    Thanks Renuplex! I’ve been googling all over for this. It surprises me that this functionality isn’t already built into a handy plugin like Search Unleashed.

    I got your code working on my site with a couple tweaks. I’m posting them here just in case anyone else is looking for this too.

    Thanks again,

    global $wp_query;
    $cats = $wp_query->get('cat');
    if($cats) {
        $sql .= " LEFT JOIN {$wpdb->prefix}term_relationships ON {$wpdb->posts}.ID = {$wpdb->prefix}term_relationships.object_id ";
        $sql .= " JOIN {$wpdb->prefix}term_taxonomy ON {$wpdb->prefix}term_relationships.term_taxonomy_id = {$wpdb->prefix}term_taxonomy.term_taxonomy_id";
    $sql .= ' WHERE 1=1 ';
    if ($cats) $sql .= " AND {$wpdb->prefix}term_taxonomy.term_id IN ($cats) ";
Viewing 2 replies - 1 through 2 (of 2 total)
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