您需要为pre_get_posts 过滤器，您可以在其中设置所需内容。请注意，您应该只更改搜索查询，因此您必须检查is_search() 方法返回true。挂钩应如下所示：

add_filter( \'pre_get_posts\', \'wpse8170_pre_get_posts\' );
function wpse8170_pre_get_posts( WP_Query $query ) {
    if ( $query->is_search() ) {
        $query->set( \'post_type\', array( \'resources\' ) );
        $query->set( \'meta_query\', array(
            array(
                \'key\' => \'resource_usertype\',
                \'value\' => array(\'Public\', \'Students\', \'Alumni\'),
                \'compare\' => \'IN\',
            )
        ) );
    }

    return $query;
}

这是完全可能的！

$args = array(
   \'post_type\' => \'resources\',
   \'meta_query\' => array(
       array(
           \'key\' => \'resource_usertype\',
           \'value\' => array(\'Public\', \'Students\', \'Alumni\'),
           \'compare\' => \'IN\',
       )
   )
 );
 $query = new WP_Query($args);