我需要修改主循环（index.php），以排除具有特定元值集的帖子（通过ACF真/假字段）。

function exclude_featured_post( $query ) {
    if ( $query->is_home() && $query->is_main_query()) {
        // in case for some reason there\'s already a meta query set from other plugin
        $meta_query = $query->get(\'meta_query\')? : [];

        // append yours
        $meta_query[] = [
            \'key\' => \'featured_post\',
            \'value\' => \'1\',
            \'compare\' => \'!=\'
        ];

        $query->set(\'meta_query\', $meta_query);
    }
}
add_action( \'pre_get_posts\', \'exclude_featured_post\' );

这不会返回帖子。我想我需要将其与主查询合并，例如：

global $wp_query;
$merged_args = array_merge( $wp_query->query, $exclude_featured_args );
$query->set(\'meta_query\', $merged_args);

然而，这也不会返回任何帖子。

Update:

使用“比较”=>“不存在”，而不是“比较”=>“！=”似乎返回所有帖子并排除meta\\u查询。

function exclude_featured_post( $query ) {
    if ( $query->is_home() && $query->is_main_query()) {
        // in case for some reason there\'s already a meta query set from other plugin
        $meta_query = $query->get(\'meta_query\')? : [];

        // append yours
        $meta_query[] = [
            \'key\' => \'featured_post\',
            \'value\' => \'1\',
            \'compare\' => \'NOT EXISTS\'
        ];

        $query->set(\'meta_query\', $meta_query);

    }
}
add_action( \'pre_get_posts\', \'exclude_featured_post\' );

从这里开始：https://core.trac.wordpress.org/ticket/18158

function exclude_featured_post( $query ) {
    if ( is_front_page() && $query->is_main_query() ) {


        $meta_query = $query->get(\'meta_query\') ? $query->get(\'meta_query\') : array();

        // append yours
        $meta_query[] = array(
            \'key\' => \'featured_post\', // please make sure that key is correct
            \'value\' => \'1\',
            \'compare\' => \'!=\' // you can also try \'NOT EXISTS\' comparison
        );

        $query->set(\'meta_query\', $meta_query);

    }
}
add_action( \'pre_get_posts\', \'exclude_featured_post\' );