Analysis on methods of CI framework extending system core classes

This article mainly introduces the method of CI framework to extend system core classes, and analyzes the steps and related operating techniques of CI framework to extend system core classes in the form of examples. Friends in need can refer to this article

The example describes how the CI framework extends the core classes of the system. Share it with everyone for your reference. The details are as follows:

First of all, your system extension class is placed under application/core. Originally, the core class of the system is CI_Controller, so you cannot start with CI_. You need to open application /config/config.php Modify:

$config['subclass_prefix'] = 'MY_';

is your prefix!

Some public modules can be uninstalled in their own core classes Got it!

I have read Dilicms (lightweight background architecture) these days. For example, his background extension class is like this:

<?php if ( ! defined(&#39;BASEPATH&#39;)) exit(&#39;No direct script access allowed&#39;);
abstract class Admin_Controller extends CI_Controller
{
  /**
  * _admin
  * 保存当前登录用户的信息
  *
  * @var object
  * @access public
  **/
  public $_admin = NULL;
  /**
  * 构造函数
  *
  * @access public
  * @return void
  */
  public function __construct()
  {
    parent::__construct();
    $this->load->library(&#39;session&#39;);
    $this->settings->load(&#39;backend&#39;);
    $this->load->switch_theme(setting(&#39;backend_theme&#39;));
    $this->_check_login();
    $this->load->library(&#39;acl&#39;);
    $this->load->library(&#39;plugin_manager&#39;);
  }
 /**
  * 检查用户是否登录
  *
  * @access protected
  * @return void
  */
  protected function _check_login()
  {
    if ( ! $this->session->userdata(&#39;uid&#39;))
    { 
      redirect(setting(&#39;backend_access_point&#39;) . &#39;/login&#39;);
    }
    else
    {
      $this->_admin = $this->user_mdl->get_full_user_by_username($this->session->userdata(&#39;uid&#39;), &#39;uid&#39;);
      if ($this->_admin->status != 1)
      {
        $this->session->set_flashdata(&#39;error&#39;, "此帐号已被冻结,请联系管理员!");
        redirect(setting(&#39;backend_access_point&#39;) . &#39;/login&#39;);
      }
    }
  }
 /**
  * 加载视图
  *
  * @access protected
  * @param string
  * @param array
  * @return void
  */
  protected function _template($template, $data = array())
  {
    $data[&#39;tpl&#39;] = $template;
    $this->load->view(&#39;sys_entry&#39;, $data);
  }
 /**
  * 检查权限
  *
  * @access protected
  * @param string
  * @return void
  */
  protected function _check_permit($action = &#39;&#39;, $folder = &#39;&#39;)
  {
    if ( ! $this->acl->permit($action, $folder))
    {
      $this->_message(&#39;对不起，你没有访问这里的权限！&#39;, &#39;&#39;, FALSE);
    }
  }
 /**
  * 信息提示
  *
  * @access public
  * @param string
  * @param string
  * @param bool
  * @param string
  * @return void
  */
  public function _message($msg, $goto = &#39;&#39;, $auto = TRUE, $fix = &#39;&#39;)
  {
    if($goto == &#39;&#39;)
    {
      $goto = isset($_SERVER[&#39;HTTP_REFERER&#39;]) ? $_SERVER[&#39;HTTP_REFERER&#39;] : site_url();
    }
    else
    {
      $goto = strpos($goto, &#39;http&#39;) !== false ? $goto : backend_url($goto);  
    }
    $goto .= $fix;
    $this->_template(&#39;sys_message&#39;, array(&#39;msg&#39; => $msg, &#39;goto&#39; => $goto, &#39;auto&#39; => $auto));
    echo $this->output->get_output();
    exit();
  }
}

It puts some public information into verification, login, and jump in Admin_Controller, so I did the same when writing the front desk and extended Font_Controller:

abstract class Font_Controller extends CI_Controller{
 public function __construct() {
  parent::__construct();
 }
 //前台加载视图方法
 public function _template($template, $data = array()){
  $data['nav'] = $this->get_nav();
  $data['tpl'] = $template;
  $this->load->view('default',$data);
 }
 //公共导航信息
 public function get_nav(){
 }
 //公共友情链接信息
 public function get_friendlink(){
 }
}

Tips, some frequently used tools and functions can be placed in helper!

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