doctrine/instantiator

# sudo composer require doctrine/instantiator

<?php
require 'vendor/autoload.php';

require_once 'hello.php'; // 如果不存在，将报错

// class hello {
//     public function sayHello() {
//         echo "hello php";
//     }
// }

$instantiator = new \Doctrine\Instantiator\Instantiator();
$instance = $instantiator->instantiate('hello');
$instance->sayHello();