如何在php中获取类的所有子类

function getAllSubclasses($className) {
    $subclasses = [];
    $allClasses = get_declared_classes();

    foreach ($allClasses as $class) {
        if (is_subclass_of($class, $className)) {
            $subclasses[] = $class;
        }
    }

    return $subclasses;
}

// 使用示例
$subclasses = getAllSubclasses('ParentClass');
print_r($subclasses);