好吧，多亏了Rup的建议，我才把这个应用到本地的所有站点上（在使用live之前会仔细检查！）

$blogs = get_sites([\'public\' => 1, \'orderby\' => \'registered\', \'order\' => \'DESC\', \'number\' => 1000]);

foreach($blogs as $blog) {
    $bid = $blog->blog_id;
    switch_to_blog($bid);

    update_option( \'admin_email\', \'[email protected]\' );
    update_option( \'new_admin_email\', \'[email protected]\' ); 
}