PHP - 在不知道类名的情况下调用实现接口的类

<?php
interface MyInterface {
    public function myMethod();
}

class MyClass implements MyInterface {
    public function myMethod() {
        echo "Hello, World!";
    }
}

// 获取接口的实现类
$interfaceName = 'MyInterface';
$implementations = [];
$classes = get_declared_classes();
foreach ($classes as $class) {
    $reflectionClass = new ReflectionClass($class);
    if ($reflectionClass->implementsInterface($interfaceName)) {
        $implementations[] = $class;
    }
}

// 调用实现了接口的类的方法
foreach ($implementations as $implementation) {
    $reflectionClass = new ReflectionClass($implementation);
    $instance = $reflectionClass->newInstance();
    $method = $reflectionClass->getMethod('myMethod');
    $method->invoke($instance);
}
?>