wordpress升级I'；在pluggable.php中找不到wp_用户

我正在从一个检查wp用户凭据的应用程序调用一个php脚本。在我将wordpress从4.3升级到4.4（和4.5）之前，这一切都很好。我真的是该整理一下了，但我不明白为什么wp用户不再可用，因为它在包含列表中

错误：在pluggable.php中找不到wp_用户

请看下面的代码

define( 'SHORTINIT', TRUE );

require_once $abspath . '/wp-load.php';
require_once $abspath . '/wp-includes/user.php';
require_once $abspath . '/wp-includes/pluggable.php';
require_once $abspath . '/wp-includes/formatting.php';   
require_once $abspath . '/wp-includes/capabilities.php';
require_once $abspath . '/wp-includes/kses.php';
require_once $abspath . '/wp-includes/meta.php';
require_once $abspath . '/wp-includes/l10n.php';
require_once $abspath . '/wp-includes/class-wp-error.php';
require_once $abspath . '/wp-includes/general-template.php';
require_once $abspath . '/wp-includes/link-template.php';

$the_authenticate = wp_authenticate_username_password('null',$user_name,$user_password);
if( is_wp_error( $the_authenticate ) ) {
    echo '{"error":"The username was not recognised"}';
}
else
{
    $the_user_authenticate_id = $the_authenticate->ID;
    $the_user = get_user_by('login', $user_name);
    $the_user_id = $the_user->ID;
if ( !$the_user ) 
{  
   //echo "{'error':'The username was not recognised'}";
}

我发现解决方案是，我现在需要包括以下内容

require_once $abspath . '/wp-includes/class-wp-roles.php';
require_once $abspath . '/wp-includes/class-wp-user.php';
require_once $abspath . '/wp-includes/class-wp-role.php';

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请任何人解释为什么wordpress 4.4中突然需要这些额外的包含，以及我的解决方案是否合理？

从wordpress.org下载更新的wordpress版本，并用更新的wordpress文件夹替换当前的wp管理员和wp包含文件夹

希望它能起作用