CI3框架初识-控制其使用注意-Call to a member function model() on null in

  入手ci3 在使用model处理数据的时候发现各种报错，结果是控制器中的构造方法需要加载父类构造方法

报错提示如下 ：  Fatal error: Call to a member function model() on null in

报错例子如下：

A PHP Error was encountered


Severity: Notice


Message: Undefined property: Blog::$load


Filename: controllers/Blog.php


Line Number: 16


Backtrace:


File: D:UPUPW_AP5.6htdocsci3applicationcontrollersBlog.php
Line: 16
Function: _error_handler


File: D:UPUPW_AP5.6htdocsci3index.php
Line: 316
Function: require_once




( ! ) Fatal error: Call to a member function model() on null in D:UPUPW_AP5.6htdocsci3applicationcontrollersBlog.php on line 16
Call Stack
# Time Memory FunctionLocation
1 0.0002 145256 {main}( )...index.php:0
2 0.0026 147632 require_once( "D:UPUPW_AP5.6htdocsci3systemcoreCodeIgniter.php" )...index.php:316
3 0.0363 318920 Blog->__construct( )...CodeIgniter.php:518
A PHP Error was encountered


Severity: Error


Message: Call to a member function model() on null


Filename: controllers/Blog.php


Line Number: 16


Backtrace: