生成随机字符串并保存到wordpress中的用户元字段的问题

Question

代码必须创建一个随机的数字和字母字符串，并将其添加为 wordpress 用户的元字段。此代码导致 User Add 部分输出如下错误：

Fatal error: Uncaught `ArgumentCountError`: Too few arguments to function `myplugin_registration_save()`, 

1 passed in <path>/class-wp-hook.php on line 286 and exactly 2 expected in <path>/functions.php:347 

Stack trace: 

    #0 <path>/wp-includes/class-wp-hook.php(286): myplugin_registration_save(51) 

    #1 <path>/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(NULL, Array) 

    #2 <path>/plugin.php(465): WP_Hook->do_action(Array) 

    #3 <path>/user.php(1857): do_action('user_register', 51) 

    #4 <path>/user.php(226): wp_insert_user(Array) 

    #5 <path>/user-new.php(148): edit_user() 

    #6 {main} thrown in <path>/functions.php on line 347

编码：

function generateRandomString($length = 30) {

    $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';

    $charactersLength = strlen($characters);

    $randomString = '';

    for ($i = 0; $i < $length; $i++) {

        $randomString .= $characters[rand(0, $charactersLength - 1)];

    }

    return $randomString;

}

add_action('user_register', 'myplugin_registration_save', 10, 1 );

function myplugin_registration_save($user_id , $length) {

    $meta_key = "pkg_autologin_code";

    $timestampz=time();

    $tokenparta = generateRandomString();

    $key = $timestampz*3 . $tokenparta;

    update_user_meta($user_id, $meta_key , $key);

    }