struct _zend_class_entry {
...
//构造方法 __construct
union _zend_function *constructor;
//析构方法 __destruct
union _zend_function *destructor;
//克隆方法 __clone
union _zend_function *clone;
union _zend_function *__get;
union _zend_function *__set;
union _zend_function *__unset;
union _zend_function *__isset;
union _zend_function *__call;
union _zend_function *__callstatic;
union _zend_function *__tostring;
//序列化
union _zend_function *serialize_func;
//反序列化
union _zend_function *unserialize_func;
...
}