我开始使用以下代码：Used with meta_query in query_posts works slowly

我更改了代码并开始使用add_filter

function filter_where($where = \'\'){
    global $wpdb;

    if($_GET[\'fromNumberOfRooms\'] > 0) {
        $where .= " AND ($wpdb->postmeta.meta_key = \'number-of-rooms\' AND $wpdb->postmeta.meta_value >= {$_GET[\'fromNumberOfRooms\']})";
    }
    if($_GET[\'upToNumberOfRooms\'] > 0) {
    $where .= " AND ($wpdb->postmeta.meta_key = \'number-of-rooms\' AND $wpdb->postmeta.meta_value <= {$_GET[\'upToNumberOfRooms\']})";
    }
    if($_GET[\'fromSize\'] > 0) {
        $where .= " AND ($wpdb->postmeta.meta_key = \'size\' AND $wpdb->postmeta.meta_value >= {$_GET[\'fromSize\']})";
    }
    if($_GET[\'upToSize\'] > 0) {
    $where .= " AND ($wpdb->postmeta.meta_key = \'size\' AND $wpdb->postmeta.meta_value <= {$_GET[\'upToSize\']})";
    }
    if($_GET[\'fromPrice\'] > 0) {
        $where .= " AND ($wpdb->postmeta.meta_key = \'price\' AND $wpdb->postmeta.meta_value >= {$_GET[\'fromPrice\']})";
    }
    if($_GET[\'upToPrice\'] > 0) {
        $where .= " AND ($wpdb->postmeta.meta_key = \'price\' AND $wpdb->postmeta.meta_value <= {$_GET[\'upToPrice\']})";
    }

    return $where;

}

add_filter(\'posts_where\', \'filter_where\');

但现在只有过滤price 或size 或number-of-rooms 如果我尝试过滤所有变量，则不会显示任何内容