我正在尝试向WP Multisite注册添加自定义字段。我找到了显示我的字段的挂钩，但我无法将其值保存到用户配置文件，因为要这样做，我需要用户ID，但在用户通过电子邮件中的链接确认注册之前，我假设用户ID不存在。我尝试了以下代码：

add_action( \'wpmu_new_user\', \'phone_register_extra_fields\' );
function phone_register_extra_fields ( $user_id, $password = "", $meta = array() ) {
    $phone_number = filter_var($_POST[\'phone_number\'], FILTER_SANITIZE_NUMBER_INT);
    update_user_meta( $user_id, \'phone_number\', $phone_number );
}

如何将字段值保存到尚未具有ID的挂起用户配置文件？上面的函数update\\u user\\u meta（）无效，因为它需要用户ID。

我发现，可以在这个钩子上访问用户ID（在通过电子邮件链接激活博客和用户之后）：

add_action( \'wpmu_activate_blog\', \'mu_add_phone_after_activation\', 10, 3 );
function mu_add_phone_after_activation( $blog_id, $user_id, $password, $signup_title, $meta ) {
    $user_phone = \'TESTnumber\';

    // $user_phone = $meta[\'user_phone\']; // How to put data in the $meta[\'user_phone\']? On which hook to take it from a $_POST[\'user_phone\'] ?

    update_user_meta( $user_id, \'phone_number\', $user_phone );      
}

但我需要存储多站点用户和博客注册页表单中的电话号码。可能可以将其存储在$meta 变量，但我尝试了很多挂钩，但都没有成功。可能是做错了。以下是我尝试的方式：

    add_filter( \'signup_user_meta\', \'mu_add_phone_in_signup\', 10, 4 );
function mu_add_phone_in_signup( $meta, $domain, $path, $title, $user, $user_email, $key ) {

    $meta[\'phone_number\'] = \'1111111\';
    return $meta;
}

add_filter( \'add_signup_meta\', \'mu_add_phone_in_signup2\', 10, 4 );
function mu_add_phone_in_signup2( $meta_defaults = array() ) {

    $meta_defaults = array( \'phone_number\'  => \'11111111\' );
    return $meta_defaults;
}

add_filter( \'signup_site_meta\', \'mu_add_phone_in_signup3\', 10, 4 );
function mu_add_phone_in_signup3( $domain, $path, $title, $user, $user_email, $key, $meta ) {

    $meta[\'phone_number\'] = \'11111111\';
    return $meta;
}

我没有太多经验，所以我快疯了，三天都做不到。感谢您的帮助：）谢谢！

// Sending custom field data to $meta
add_filter(\'add_signup_meta\', \'sb_add_signup_meta\');
function sb_add_signup_meta($meta) {
    if( isset( $_POST[\'phone_number\'] ) ) {
        $phone_number = filter_var( $_POST[\'phone_number\'], FILTER_SANITIZE_NUMBER_INT );
        $meta[\'phone_number\'] = $phone_number;
        return $meta;
    }
    else return $meta;
}

// Updating user meta on user activation. Works only if user chose registration without a blog
add_action(\'wpmu_activate_user\',\'activate_user\',10,3);
function activate_user( $user_id, $password, $meta )   {

    if ( isset( $meta[\'phone_number\'] ) ) {
        update_user_meta( $user_id, "phone_number", $meta[\'phone_number\'] );    
    }
}

// Updating user meta on user activation when user has regisration + gets a blog.
add_action( \'wpmu_activate_blog\', \'mu_add_roles_after_activation\', 10, 3 );
function mu_add_roles_after_activation( $blog_id, $user_id, $password, $signup_title, $meta ) {

    $user_info = get_userdata( $user_id );

    $user_login = $user_info->user_login;

    global $wpdb;

    $signup = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->signups WHERE user_login = %s", $user_login ) );

    $meta = maybe_unserialize( $signup->meta );

    if ( isset( $meta[\'phone_number\'] ) ) {
        update_user_meta( $user_id, "phone_number", $meta[\'phone_number\'] );    
    }   
}