[spl_autoload_register 自动导入类](spl_autoload_register%E8%87%AA%E5%8A%A8%E5%AF%BC%E5%85%A5%E7%B1%BB.md) [class_parents 返回指定类的父类](SPL%E5%87%BD%E6%95%B0/class_parents%E8%BF%94%E5%9B%9E%E6%8C%87%E5%AE%9A%E7%B1%BB%E7%9A%84%E7%88%B6%E7%B1%BB.md) [spl_object_hash/spl_object_id](SPL%E5%87%BD%E6%95%B0/spl_object_hash-spl_object_id.md)