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How can I return all posts that match a specific taxonomy using <?php get_search_form(); ?>

For example: if a user enters a search query that matches the name of a tag or category, search.php will return all posts with a matching tag, or that fall into a matching category. I am working with a custom post type, and as of now, get_search_form(); seems to only return matches based on content and title alone. Please Help! Thanks.

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If somebody types in a tag or category, do you only want the posts with that tag/category, or do you want to include the regular search results in addition to the tag/category results? –  Andy Adams Dec 20 '12 at 23:17
    
Have a look at the Relevanssi plugin –  bungeshea Dec 21 '12 at 1:54
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1 Answer

use this function put in function.php file for cat=22 filter change your cat id for you mind

function my_search_form( $form ) { 

    $form = '<form role="search" method="get" id="searchform" action="' . home_url( '/' ) . '" >
    <div><label class="screen-reader-text" for="s">' . __('Search for:') . '</label>
    <input type="text" value="' . get_search_query() . '" name="s" id="s" />
   <input type="text" value="22" name="cat" id="scat" />
    <input type="submit" id="searchsubmit" value="'. esc_attr__('Search') .'" />
    </div>
    </form>';

    return $form;
}

add_filter( 'get_search_form', 'my_search_form' );
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