can’t limit search to only pages

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I’m trying to limit a search to only pages, but it isn’t working properly. When I include this hidden field in the search form: 

<input type="hidden" name="post_type" value="page" />

The results include posts, pages, and custom post types. If I change the above to search only posts, it works properly, and only posts are displayed. Anyone have any ideas why it won’t properly restrict my post to only display pages?

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I need to restrict the results for this search form only, so modifying the search query results in the search results template or in functions.php won’t work for me.

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  1. A quick test on a default install with TwentyEleven confirms this, and I’m not sure why this is the case, however there is a way you can do this via your functions.php.

    add a hidden field to the form with your own query var:

    <input type="hidden" name="my_type" value="page" />

    or:

    <input type="hidden" name="my_type" value="post,page" />

    add the new query var to WP’s recognized query vars:

    function wpse50828_query_vars( $query_vars ){
    $query_vars[] = 'my_type';
    return $query_vars;
}
add_filter( 'query_vars', 'wpse50828_query_vars' );

    add your code to set the post type when that query var is set:

    function wpse50828_search( $query ){
    if( get_query_var('my_type') )
        $query->set('post_type', explode( ',', get_query_var('my_type') ));

    return $query;
}
add_action( 'parse_query','wpse50828_search' );