phpSPO 身份认证报错：AuthenticationContext类未找到问题的解决方法

Looks like you've hit a common namespace change issue with the phpSPO library starting from version 2.x! Let's fix this up quickly.

The Problem Context #

You're using vgrem/php-spo": "^2.5" installed via Composer, and when running your code, you're seeing this error:

Fatal error: Uncaught Error: Class "Office365\PHP\Client\Runtime\Auth\AuthenticationContext" not found

This happens because the namespace structure was simplified in phpSPO 2.x versions—the old Office365\PHP\Client\... namespace path is no longer used in newer releases.

The Fix #

Update your namespace imports to remove the PHP\Client segment. Replace your existing use statements with these:

use Office365\Runtime\Auth\AuthenticationContext;
use Office365\SharePoint\ClientContext;
use Office365\SharePoint\ListCreationInformation;
use Office365\SharePoint\SPList;

Quick Extra Check #

Make sure your autoload path is correctly pointing to Composer's autoloader. If your script isn't in the same directory as the vendor folder, use a relative path with __DIR__ to avoid issues:

require_once(__DIR__ . '/vendor/autoload.php');

内容的提问来源于stack exchange，提问作者Jeppe Donslund