根据主题的设置方式，comments_open 可能是您想要的筛选器。（在functions.php中）

add_filter( \'comments_open\', \'block_comments_for_others\', 10, 2 );
function block_comments_for_others( $is_open, $post_id ) {

    $is_open = false;
    $post_author_id = get_post_field( \'post_author\', $post_id );

    if ( get_current_user_id() == $post_author_id || current_user_can(\'administrator\') )
        $is_open = true;

    return $is_open;
}

if ( get_current_user_id() == get_the_author_meta( \'ID\' ) || current_user_can(\'administrator\') ) {
    comments_template(); 
} else {
    echo "No commenting for you";
}