这个查询运行得很好，但现在我遇到了问题，因为我切换到了多站点。我添加了“global$switched”和“switch\\u to\\u blog（4）”，删除“tax\\u query”参数后效果很好！但当我把它加回来时，它不会返回任何结果。

global $switched;
switch_to_blog(4);

$args = array( 
        \'post_type\' => \'grille\', 
        \'posts_per_page\' => 1,
        \'no_found_rows\' => true,
        \'meta_key\'          => \'heure_debut\',
        \'orderby\'           => \'meta_value\',
        \'order\'             => \'DESC\',
        \'meta_query\' => array(
                            \'relation\' => \'AND\',
                            array(
                                \'key\' => \'type_du_programme\',
                                \'value\' => \'emission\',
                                \'compare\' => \'=\'
                            ),
                            array(
                                \'key\' => \'heure_debut\',
                                \'value\' => $current_time,
                                \'compare\' => \'<\'
                            )                                   
        ),
        \'tax_query\' => array(
                            array(
                                \'taxonomy\' => \'jours_de_diffusion\',
                                \'field\'    => \'slug\',
                                \'terms\' => $current_day
                            )
                        ) 
        );

    $loop = new WP_Query( $args );