ABAKUS

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   // Add a category to a post for each of selected tags the post already has.
   // Modify the $tag_categories array.  Use one tag name => one category name
   function mam_add_category ($post_id = 0) {
     if (!$post_id) return;
     $tag_categories = array ( // The tag names and the corresponding category name to add
       'info' => 'information',
       'INFO' => 'information',
          'search optimization' => 'SEO',
     );
     $post_tags = get_the_tags($post_id);
     foreach ($post_tags as $tag) {
       if ($tag_categories[$tag->name] ) {
         $cat_id = get_cat_ID($tag_categories[$tag->name]);
         if ($cat_id) {
           $result =  wp_set_post_terms( $post_id, $tags = $cat_id, $taxonomy = 'category', $append = true );
         }
       }
     }
   }
add_action('publish_post','mam_add_category');
?>