致命错误：未捕获错误：未找到类'EthereumRPC \ EthereumRPC'

I've been playing with this for hours now, finding all kind of autoloaders but I can't figure it out:

declare(strict_types=1);

function __autoload($class_name) 
{
    //class directories
    $directorys = array(
        'EthereumRPC/',
        'EthereumRPC/API/',
        'EthereumRPC/API/Personal/',
        'EthereumRPC/Contracts/',
        'EthereumRPC/Contracts/ABI/',
        'EthereumRPC/Exception/',
        'EthereumRPC/Response/',
        'ERC20/',
        'ERC20/data/',
        'ERC20/Exception/'
    );

    //for each directory
    foreach($directorys as $directory)
    {
        //see if the file exsists
        if(file_exists($directory.$class_name . '.php'))
        {
            require_once($directory.$class_name . '.php');
            //only require the class once, so quit after to save effort (if you got more, then name them something else 
            return;
        }            
    }
}

use EthereumRPC\EthereumRPC;
use ERC20\ERC20;

I load every directory that contains classes but I still end up with the error:

Fatal error: Uncaught Error: Class 'EthereumRPC\EthereumRPC' not found in /home/sewicumg/public_html/contenthourlies.com/wp-content/themes/seoexp/account_client.php:62

The instruction file said to only include the two lines at the bottom but that definitely didn't work.

Am I missing something?

Here is the code that uses the classes:

$geth = new EthereumRPC('127.0.0.1', 8545);
$erc20 = new ERC20($geth);

All those EthereumRPC and ERC20 folders are in the same directory as the php file that this code is in.

Am I missing something here?