struct _zend_class_entry {
    char type;     // 类型：ZEND_INTERNAL_CLASS / ZEND_USER_CLASS
    char *name;// 类名称
    zend_uint name_length;                  // 即sizeof(name) - 1
    struct　_zend_class_entry *parent; // 继承的父类
    int　refcount;  // 引用数
    zend_bool constants_updated;
    zend_uint ce_flags; // ZEND_ACC_IMPLICIT_ABSTRACT_CLASS: 类存在abstract方法
    // ZEND_ACC_EXPLICIT_ABSTRACT_CLASS: 在类名称前加了abstract关键字
    // ZEND_ACC_FINAL_CLASS
    // ZEND_ACC_INTERFACE
    HashTable function_table;      // 方法
    HashTable default_properties;          // 默认属性
    HashTable properties_info;     // 属性信息
    HashTable default_static_members;// 类本身所具有的静态变量
    HashTable *static_members; // type == ZEND_USER_CLASS时，取&default_static_members;
    // type == ZEND_INTERAL_CLASS时，设为NULL
    HashTable constants_table;     // 常量
    struct _zend_function_entry *builtin_functions;// 方法定义入口
    union _zend_function *constructor;
    union _zend_function *destructor;
    union _zend_function *clone;
    /* 魔术方法 */
    union _zend_function *__get;
    union _zend_function *__set;
    union _zend_function *__unset;
    union _zend_function *__isset;
    union _zend_function *__call;
    union _zend_function *__tostring;
    union _zend_function *serialize_func;
    union _zend_function *unserialize_func;
    zend_class_iterator_funcs iterator_funcs;// 迭代
    /* 类句柄 */
    zend_object_value (*create_object)(zend_class_entry *class_type TSRMLS_DC);
    zend_object_iterator *(*get_iterator)(zend_class_entry *ce, zval *object,
        intby_ref TSRMLS_DC);
    /* 类声明的接口 */
    int(*interface_gets_implemented)(zend_class_entry *iface,
            zend_class_entry *class_type TSRMLS_DC);
    /* 序列化回调函数指针 */
    int(*serialize)(zval *object， unsignedchar**buffer, zend_uint *buf_len,
             zend_serialize_data *data TSRMLS_DC);
    int(*unserialize)(zval **object, zend_class_entry *ce, constunsignedchar*buf,
            zend_uint buf_len, zend_unserialize_data *data TSRMLS_DC);
    zend_class_entry **interfaces;  //  类实现的接口
    zend_uint num_interfaces;   //  类实现的接口数
    char *filename; //  类的存放文件地址 绝对地址
    zend_uint line_start;   //  类定义的开始行
    zend_uint line_end; //  类定义的结束行
    char *doc_comment;
    zend_uint doc_comment_len;
    struct _zend_module_entry *module; // 类所在的模块入口：EG(current_module)
};

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;
    ...
}

class ParentBase {
  static $property = 'Parent Value';
  public static function render() {
    //return self::$property;
    return static::$property;
  }
}
class Descendant extends ParentBase {
  static $property = 'Descendant Value';
}
echo Descendant::render();  //Descendant Value

if (fbc->op_array.fn_flags & ZEND_ACC_PUBLIC) {
    //公有方法，可以访问
} else if (fbc->op_array.fn_flags & ZEND_ACC_PRIVATE) {
    //  私有方法，报错
} else if ((fbc->common.fn_flags & ZEND_ACC_PROTECTED)) {
    //  保护方法，报错
}

interface Animal {
    public function run();
}
class Dog implements Animal {
    public function run() {
        echo 'dog run';
    }
}
class  Cat implements Animal{
    public function run() {
        echo 'cat run';
    }
}

typedef struct _zend_object_value {
    zend_object_handle handle;
        //  unsigned int类型，EG(objects_store).object_buckets的索引
    zend_object_handlers *handlers;
} zend_object_value;

typedef struct _zend_object {
    zend_class_entry *ce;
    HashTable *properties;
    HashTable *guards; /* protects from __get/__set ... recursion */
} zend_object;