When yii2 php namespace introduces third-party non-namespace library files, the error is reported: Class not found solution_PHP tutorial

Solution to the error: Class not found when introducing third-party non-namespace library files in yii2 php namespace

A class file is the library method of namespace

Introduce the class in the following way and report an error Class Not Found:

namespace frontend\block\customer\account;
use Yii;
use frontend\block\Blockbase;
//use yii\base\Model;
//use backend\models\helper\Base.php
use frontend\models\core\Request;
use frontend\models\core\Customer;
use frontend\models\core\User;
use frontend\models\core\Url;
use frontend\models\core\Func;
use frontend\models\core\Email;
use frontend\models\core\Help;
use frontend\models\core\Session;
use frontend\models\core\Config;
use frontend\models\core\Store;
use frontend\models\core\Message;
use frontend\models\core\Date;
use frontend\models\core\Mongodb;

use Facebook\FacebookSession;
use Facebook\FacebookRedirectLoginHelper;
use Facebook\FacebookRequest;
use Facebook\FacebookResponse;
use Facebook\FacebookSDKException;
use Facebook\FacebookRequestException;
use Facebook\FacebookAuthorizationException;
use Facebook\GraphObject;
use Facebook\Entities\AccessToken;
use Facebook\HttpClients\FacebookCurlHttpClient;
use Facebook\HttpClients\FacebookHttpable;



class Login extends Blockbase
{
   

public function getGoogleLoginUrl(){
        $lib_google_base = Yii::getAlias("@common/lib/google");
        //echo $lib_google_base.'/Social.php';exit;
        $lib_google_base = Yii::getAlias("@common/lib/google");
        include $lib_google_base.'/Social.php';
        $Social_obj= new Social();

        $url = $Social_obj->google();
        return $url;
    }

}

You need to change $Social_obj= new Social(); to:

$Social_obj= new \Social();

That means adding a backslash, haha, it took me an hour.

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