摘要：
DATABASESYSTEM CONCEPTS SIXTH EDITION Abraham Silberschatz Yale University Henry F. KorthLehigh University S. SudarshanIndian Institute of Technology, 阅读全文
摘要：
PHP Advanced and Object-OrientedProgrammingVisual Quickpro GuideLarry Ullman //11 In PHP 5, when you create a copy of an object, PHP actually creates 阅读全文