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Exclude Categories from the archive pages

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the numbers 108 and 18 are the category ids i wanted to exclude

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  1. add_action('pre_get_posts', 'gloss_remove_glossary_cat' );
  2.  
  3. function gloss_remove_glossary_cat( $notused )
  4. {
  5.   global $wp_query;
  6.   global $gloss_category;
  7.  
  8.   // Figure out if we need to exclude glossary - exclude from
  9.   // archives (except category archives), feeds, and home page
  10.   if( ( is_archive() )) {
  11.      $wp_query->query_vars['cat'] = '-108,-18' . $gloss_category;
  12.   }
  13. }

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