Edited again to demonstrate adding and removing filters:

将这些常规功能包括在functions.php. 以下是您将为循环调用的过滤器，在这些循环中，您希望通过以下两个元值限制查询：

function date_check_join( $join ) {
    global $wpdb;
    $join .= " JOIN ".$wpdb->postmeta." AS startdate ON 
        (".$wpdb->posts.".ID = startdate.post_id AND
        startdate.meta_key = \'start_date\')
        JOIN ".$wpdb->postmeta." AS enddate ON 
        (".$wpdb->posts.".ID = enddate.post_id AND
        enddate.meta_key = \'end_date\')";
    return $join;
    }

function date_check_where( $where ) {
    $today = date(\'Ymd\');
    $where .= " AND startdate.meta_value <= $today
    AND enddate.meta_value >= $today";
    return $where;
    }

现在，在要包含这些过滤器的页面上，在要过滤的循环之前添加它们，然后删除它们。例如：

add_filter( \'posts_join\', \'date_check_join\' );
add_filter( \'posts_where\', \'date_check_where\' );

query_posts( "yourqueryhere" );
if (have_posts()) : while (have_posts()) : the_post();
// This loop will only includes where today is between start_date and end_date
endwhile; endif;

query_posts( "anotherqueryhere" );
if (have_posts()) : while (have_posts()) : the_post();
// This loop also only includes where today is between start_date and end_date
endwhile; endif;

remove_filter( \'posts_join\', \'date_check_join\' );
remove_filter( \'posts_where\', \'date_check_where\' );

query_posts( "thirdqueryhere" );
if (have_posts()) : while (have_posts()) : the_post();
// This loop is not affected by the filters, so you can query for posts 
// where start_date is in the future, or end_date in the past, etc.
endwhile; endif;

您只需在搜索之前将条件添加到“posts\\u join”和“posts\\u where”过滤器中，然后将其删除（否则这些条件将应用于您网站上的所有内容，包括页面、菜单等）

如果可以通过仅比较一个字段来简化此操作，那么可以使用meta_compare attribute 内置于WP\\U查询对象中。您可以为帖子安排开始日期（这样它们就不会提前显示），然后在查询时将日期与结束日期自定义字段进行比较。