1 /**2 * 钩子嘛，就是在不修改系统核心文件的基础上来改变或增加系统的核心运行功能3 */
4 classCI_Hooks {5
6 /**7 * 检测hook是否开启8 */
9 var $enabled = FALSE;10 /**11 * config/hooks.php中的hooks配置信息12 */
13 var $hooks = array();14 //防止死循环，因为钩子程序里面可能还还有钩子
15 var $in_progress = FALSE;16
17 //构造函数
18 function__construct()19 {20 $this->_initialize();21 log_message(‘debug‘, "Hooks Class Initialized");22 }23
24 /**25 * 初始化，获取hooks配合26 */
27 function_initialize()28 {29 $CFG =& load_class(‘Config‘, ‘core‘);30
31 //检测配置是否开启钩子
32 if ($CFG->item(‘enable_hooks‘) == FALSE)33 {34 return;35 }36
37 //检测是否配置钩子
38 if (defined(‘ENVIRONMENT‘) AND is_file(APPPATH.‘config/‘.ENVIRONMENT.‘/hooks.php‘))39 {40 include(APPPATH.‘config/‘.ENVIRONMENT.‘/hooks.php‘);41 }42 elseif (is_file(APPPATH.‘config/hooks.php‘))43 {44 include(APPPATH.‘config/hooks.php‘);45 }46
47
48 if ( ! isset($hook) OR ! is_array($hook))49 {50 return;51 }52
53 $this->hooks =& $hook;54 $this->enabled = TRUE;55 }56
57 //--------------------------------------------------------------------
58
59 /**60 * 运行钩子程序，外部就是这样调用：61 * $EXT =& load_class(‘Hooks‘, ‘core‘);62 * $EXT->_call_hook(‘pre_system‘);63 */
64 function _call_hook($which = ‘‘)65 {66 if ( ! $this->enabled OR ! isset($this->hooks[$which]))67 {68 return FALSE;69 }70 //CI支持多次钩子，那么就是二维数组
71 if (isset($this->hooks[$which][0]) AND is_array($this->hooks[$which][0]))72 {73 foreach ($this->hooks[$which] as $val)74 {75 $this->_run_hook($val);76 }77 }78 else
79 {80 //一个钩子直接运行钩子
81 $this->_run_hook($this->hooks[$which]);82 }83
84 return TRUE;85 }86
87 //--------------------------------------------------------------------
88
89 /**90 * Run Hook91 *92 * Runs a particular hook93 *94 * @access private95 * @param array the hook details96 * @return bool97 */
98 function _run_hook($data)99 {100 if ( ! is_array($data))101 {102 return FALSE;103 }104
105 //防止死循环，因为钩子程序里面可能还还有钩子
106 if ($this->in_progress == TRUE)107 {108 return;109 }110
111 //设置路径112 //下面可以filepathfilepath就以那个文件夹(application)为基准，application/hooks下, 你可以把hooks 作为你的filepath
113
114 if ( ! isset($data[‘filepath‘]) OR ! isset($data[‘filename‘]))115 {116 return FALSE;117 }118
119 $filepath = APPPATH.$data[‘filepath‘].‘/‘.$data[‘filename‘];120
121 if ( ! file_exists($filepath))122 {123 return FALSE;124 }125
126 //-----------------------------------127 // Set class/function name128 // -----------------------------------
129
130 $class = FALSE;131 $function = FALSE;132 $params = ‘‘;133
134 if (isset($data[‘class‘]) AND $data[‘class‘] != ‘‘)135 {136 $class = $data[‘class‘];137 }138
139 if (isset($data[‘function‘]))140 {141 $function = $data[‘function‘];142 }143
144 if (isset($data[‘params‘]))145 {146 $params = $data[‘params‘];147 }148
149 if ($class === FALSE AND $function === FALSE)150 {151 return FALSE;152 }153
154 //不用多说了吧
155 $this->in_progress = TRUE;156
157 //获取钩子配置信息成功后，运行钩子程序
158 if ($class !== FALSE)159 {160 if ( ! class_exists($class))161 {162 require($filepath);163 }164
165 $HOOK = new $class;166 $HOOK->$function($params);167 }168 else
169 {170 if ( ! function_exists($function))171 {172 require($filepath);173 }174
175 $function($params);176 }177 执行相应程序完毕后，重新把当前hook的状态改为非运行中，以让它可以再次被触发。
178 $this->in_progress = FALSE;179 return TRUE;180 }181
182 }
