Thread: Filter search by custom parameter and meta query

/?s=carpintero&zona=Berazategui

add_action( 'pre_get_posts', 'search_filter' );
function search_filter($query) {

  if ( !is_admin() && is_search() && $query->is_main_query() ) {

    if ( isset($_GET['zona']) && !empty($_GET['zona']) ){

        //Get original meta query
        $meta_query = $query->get('meta_query');

        //Add our meta query to the original meta queries
        $meta_query[] = array(
            'key'     => 'cp_zonas',
            'value'   => $_GET['zona'],
            'compare' => '='
        );

        $query->set('meta_query',$meta_query);

    }

  }

}

Array
(
    [s] => carpintero
    [error] => 
    [m] => 0
    [p] => 0
    [post_parent] => 
    [subpost] => 
    [subpost_id] => 
    [attachment] => 
    [attachment_id] => 0
    [name] => 
    [static] => 
    [pagename] => 
    [page_id] => 0
    [second] => 
    [minute] => 
    [hour] => 
    [day] => 0
    [monthnum] => 0
    [year] => 0
    [w] => 0
    [category_name] => 
    [tag] => 
    [cat] => 
    [tag_id] => 
    [author_name] => 
    [feed] => 
    [tb] => 
    [paged] => 0
    [comments_popup] => 
    [meta_key] => 
    [meta_value] => 
    [preview] => 
    [sentence] => 
    [fields] => 
    [menu_order] => 
    [category__in] => Array
        (
        )

    [category__not_in] => Array
        (
        )

    [category__and] => Array
        (
        )

    [post__in] => Array
        (
        )

    [post__not_in] => Array
        (
        )

    [tag__in] => Array
        (
        )

    [tag__not_in] => Array
        (
        )

    [tag__and] => Array
        (
        )

    [tag_slug__in] => Array
        (
        )

    [tag_slug__and] => Array
        (
        )

    [post_parent__in] => Array
        (
        )

    [post_parent__not_in] => Array
        (
        )

    [meta_query] => Array
        (
            [0] => Array
                (
                    [key] => cp_zonas
                    [value] => Berazategui
                    [compare] => =
                )

        )

    [ignore_sticky_posts] => 
    [suppress_filters] => 
    [cache_results] => 1
    [update_post_term_cache] => 1
    [update_post_meta_cache] => 1
    [post_type] => any
    [posts_per_page] => 7
    [nopaging] => 
    [comments_per_page] => 4
    [no_found_rows] => 
    [search_terms] => Array
        (
            [0] => carpintero
        )

    [order] => DESC
)