有需要的没有积分的，可以发邮件h5ru@qq.com，我发给你。
PSR-4: Autoloader
This PSR describes a specification for autoloading classes from file paths. It is fully interoperable, and can be used in addition to any other autoloading specification, including PSR-0. This PSR also describes where to place files that will be autoloaded according to the specification.
