<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class CI_Hooks {
 var $enabled = FALSE; 
 //開啟hook的標志，默認是關(guān)閉的。APPPATH/config/config.php中的配置也是默認關(guān)閉的，如果想使用hook，要在config.php中開啟。
 var $hooks = array();
 //在_initialize()函數(shù)初始化的過程中將APPPATH/config/hook.php中定義的hook數(shù)組，引用到$this->hooks;
 var $in_progress  = FALSE;
 //當一個hook執(zhí)行的時候，會給標記 $in_process = TRUE ，是為了防止同一個hook被同時調(diào)用。
 function __construct()
 {
  $this->_initialize();
  log_message('debug', "Hooks Class Initialized");
 }
 function _initialize()
 {
  //初始化hook
  //判斷config.php中是否開啟hook
  //include（hook.php），將文件里定義的hook數(shù)組引用到$this->hooks
  //$this->enable = TRUE 
 }
 function _call_hook($which = '')//pre_system
 {
  //以pre_system掛鉤點為例，當調(diào)用_call_hook('pre_system')時
  //確保$this->enable = TRUE && 定義了$this->hooks['pre_system']
  //如果是二維數(shù)組就遍歷，依次_run_hook($this->hooks['pre_system'][$val])
  //如果是一維數(shù)組，那么直接_run_hook($this->hooks['pre_system'])
 }
 function _run_hook($data) //$data 是傳遞過來的hook數(shù)組
 {
  //$data 就是我們在APPPATH/config/hook.php 定義的hook數(shù)組
  //$hook['pre_controller'] = array(
  // 'class'  => 'MyClass',
  // 'function' => 'Myfunction',
  // 'filename' => 'Myclass.php',
  // 'filepath' => 'hooks',
  // 'params'  => array('beer', 'wine', 'snacks')
  // );
  //取出data里面的數(shù)據(jù)，加載
  APPPATH.$data['filepath'].$data['filename'];
  //實例化鉤子類，調(diào)用function。應用到示例中就是
  $this->in_process = TRUE;
  $Hook = new MyClass();
  $Hook->Myfunction($params);
  $this->in_process = FALSE;
  }
}
?>