WordPress custom post type search result custom template

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function template_chooser($template)   
{    
    global $wp_query;   
    $post_type = get_query_var('post_type');   
    if( $wp_query->is_search && $post_type == 'learn' )   
    {
        return locate_template('archive-learn.php');
    }   
    return $template;
}
add_filter('template_include', 'template_chooser');
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