Searching within given categories/taxonomy terms only

Solution #1 - via options (easy)
There is an option to restrict results to terms in the plugin back-end. Please check this documentation.
Solution #2 - Programatical restriction via custom code
For more advanced restrictions you can use the asp_query_args filter.
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add_filter( 'asp_query_args', 'asp_include_only_term_ids', 2, 2 );
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function asp_include_only_term_ids( $args, $id ) {
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  /**
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   * Enter the desired taxonomy=>terms here.
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   * For example, if you want to search category 1 and 2, then:
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   *  "category" => "1,2"      
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   */      
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  $include = array(
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    "category" => "1,2,3,4",
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    "post_tag" => "4,5,6,7"
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  );
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  // Allow results, that does not have connection with the taxonomies
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  $allow_empty = true;
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  // -- !! Do not change anything below this line !! --
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  if ( !is_array($args['post_tax_filter']) )
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    $args['post_tax_filter'] = array();
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  foreach ($include as $tax => $term_string) {
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    $terms = explode(",", $term_string);
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    foreach ($terms as $tk => &$tv)
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      $tv = trim($tv);
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    $args['post_tax_filter'][] = array(
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      'taxonomy'  => $tax,
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      'include'   => $terms
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    );
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  }
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  return $args;
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}
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Showing the post type name in result title or content

Search only in the same category as the current post or page (single page)

Last modified 1yr ago

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Contents

Solution #1 - via options (easy)

Solution #2 - Programatical restriction via custom code