后端开发|php教程
hooks,hook,function,Class,data
后端开发-php教程
CI框架源码阅读———钩子类hooks.php
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_initialize();log_message(debug, "Hooks Class Initialized");}// --------------------------------/** * Initialize the Hooks Preferences 参数，首选项 * 初始化钩子 * @accessprivate * @returnvoid */function _initialize(){$CFG =& load_class(Config, core);// If hooks are not enabled in the config file// there is nothing else to do// 如果配置文件中设置了是不允许hooks，则直接返回退出本函数。if ($CFG->item(enable_hooks) == FALSE){return;}// Grab the "hooks" definition file.// 抓取钩子的定义文件// If there are no hooks, we e done.// 如果没有定义hooks.php没有定义$hook数组我们直接返回if (defined(ENVIRONMENT) AND is_file(APPPATH.config/.ENVIRONMENT./hooks.php)){ include(APPPATH.config/.ENVIRONMENT./hooks.php);}elseif (is_file(APPPATH.config/hooks.php)){include(APPPATH.config/hooks.php);}if ( ! isset($hook) OR ! is_array($hook)){return;}// 将hooks.php 中的$hook数组引用到$this->hooks// 开启$this->enabled$this->hooks =& $hook;$this->enabled = TRUE;}// --------------------------------/** * Call Hook * 外部其实就是调用这个_call_hook函数进行调用钩子程序。 * 而此方法中再调用_run_hook去执行相应的钩子。 * Calls a particular hook * * @accessprivate * @paramstringthe hook name * @returnmixed */function _call_hook($which = \){// 判断$this->enabled 是否开启 和 要调用的钩子是否在$htis->hooks中存在。if ( ! $this->enabled OR ! isset($this->hooks[$which])){return FALSE;}// 判断要调用的钩子是否是一个二维数组，如果是就遍历执行。// 如果不是二维数组就直接执行// 这里说明，在一个挂钩点可以执行多个钩子，就是通过定义二维数组来实现的。if (isset($this->hooks[$which][0]) AND is_array($this->hooks[$which][0])){foreach ($this->hooks[$which] as $val){$this->_run_hook($val);}}else{$this->_run_hook($this->hooks[$which]);}return TRUE;}// --------------------------------/** * Run Hook * 运行钩子 * Runs a particular 特别的 hook * * @accessprivate * @paramarraythe hook details * @returnbool */function _run_hook($data){/* * $data 就是我们在APPPATH/config/hook.php 定义的hook数组 * $hook[pre_controller] = array( * class => MyClass, * function => Myfunction, * filename => Myclass.php, * filepath => hooks, * params => array(eer, wine, snacks) * ); * * 由于每一个钩子肯定是由数组组成的 * 所以这里就判断$data是不是数组如果不是则返回 * */if ( ! is_array($data)){return FALSE;}// -----------------------------------// Safety - Prevents run-away loops// -----------------------------------// If the script being called happens to have the same// hook call within it a loop can happen// 如果调用某一个hook，执行某些脚本，而有可能这些脚本里面再会触发其它hook// 如果这个其它hook里面又包含了当前// 的hook，那么就会进入死循环，这个in_progress的存在就是阻止这种情况。if ($this->in_progress == TRUE){return;}// -----------------------------------// 取出data里面的数据，加载 APPPATH.$data[filepath].$data[filename]; // Set file path// -----------------------------------if ( ! isset($data[filepath]) OR ! isset($data[filename])){return FALSE;}$filepath = APPPATH.$data[filepath]./.$data[filename];if ( ! file_exists($filepath)){return FALSE;}// -----------------------------------// Set class/function name// -----------------------------------$class= FALSE;$function= FALSE;$params= \;// 取出$hooks 中的class function params if (isset($data[class]) AND $data[class] != \){$class = $data[class];}if (isset($data[function])){$function = $data[function];}if (isset($data[params])){$params = $data[params];}if ($class === FALSE AND $function === FALSE){return FALSE;}// -----------------------------------// Set the in_progress flag// 在开始执行钩子相应的程序之前，先把当前hook的状态设为正在运行中。// -----------------------------------$this->in_progress = TRUE;// -----------------------------------// Call the requested class and/or function// 包含钩子文件并实例化类，调用函数// -----------------------------------if ($class !== FALSE){if ( ! class_exists($class)){require($filepath);}$HOOK = new $class;$HOOK->$function($params);}else{if ( ! function_exists($function)){require($filepath);}$function($params);}// 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。$this->in_progress = FALSE;return TRUE;}}// END CI_Hooks class/* End of file Hooks.php *//* Location: ./system/core/Hooks.php */
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