WordPress: Search with multiple taxonomies

gistfile1.aw

<?php 
add_action('pre_get_posts', '_custom_search');

function _custom_search()
{
    global $wp_query;
    
    if ( $wp_query->query_vars['post_type'] != REALTY_POST_TYPE ||
         !$wp_query->is_post_type_archive ) {
        return false;
    }
        
    $tax_query = array();
    $operacion = get_query_var('operacion');
    $ubicacion = get_query_var('ubicacion');
    $area      = get_query_var('area');
    $precio    = get_query_var('precio');
    
    // Tipo de operaciones
    if (!empty($operacion) && $operacion > 0) {
        $tax_query[] = array(
            'taxonomy' => 'jab_realty_operation',
            'field'    => 'id',
            'terms'    => $operacion
        );
    }
    
    // location
    if (!empty($ubicacion) && $ubicacion > 0) {
        $tax_query[] = array(
            'taxonomy' => 'jab_realty_location',
            'field'    => 'id',
            'terms'    => $ubicacion
        );
    }
    
    // Precios
    if (!empty($precio) && $precio > 0) {
        $tax_query[] = array(
            'taxonomy' => 'jab_realty_pricerange',
            'field'    => 'id',
            'terms'    => $precio
        );
    }
    
    if ( sizeof($tax_query) > 0 ) {
        $tax_query['relation'] = 'AND';
        
        $wp_query->query_vars['tax_query'] = $tax_query;
    }
    
    // Area
    if (!empty($area) && $area > 0) {
        $meta_query = array();
        
        $meta_query[] = array(
            'key'     => 'jab_realty_area',
            'value'   => $area,
            'compare' => '=',
            'type'    => 'NUMERIC'
        );
        
        $wp_query->query_vars['meta_query'] = $meta_query;
    }
    
    return false;
}