钩子机制

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<?php header('Content-Type: text/html;charset=UTF-8'); ?><!DOCTYPE html><html><?phpclass Hook {    //action hooks array      private static $actions = array();    /**     * ads a function to an action hook     * @param $hook     * @param $function     */    public static function add_action($hook,$function)    {           $hook=mb_strtolower($hook,CHARSET);        // create an array of function handlers if it doesn't already exist        if(!self::exists_action($hook))        {            self::$actions[$hook] = array();        }        // append the current function to the list of function handlers        if (is_callable($function))        {            self::$actions[$hook][] = $function;            return TRUE;        }        return FALSE ;    }    /**     * executes the functions for the given hook     * @param string $hook     * @param array $params     * @return boolean true if a hook was setted     */    public static function do_action($hook,$params=NULL)    {        $hook=mb_strtolower($hook,CHARSET);        if(isset(self::$actions[$hook]))        {            // call each function handler associated with this hook            foreach(self::$actions[$hook] as $function)            {                if (is_array($params))                {                    call_user_func_array($function,$params);                }                else                {                    call_user_func($function);                }                //cant return anything since we are in a loop! dude!            }            return TRUE;        }        return FALSE;    }    /**     * gets the functions for the given hook     * @param string $hook     * @return mixed     */    public static function get_action($hook)    {        $hook=mb_strtolower($hook,CHARSET);        return (isset(self::$actions[$hook]))? self::$actions[$hook]:FALSE;    }    /**     * check exists the functions for the given hook     * @param string $hook     * @return boolean     */    public static function exists_action($hook)    {        $hook=mb_strtolower($hook,CHARSET);        return (isset(self::$actions[$hook]))? TRUE:FALSE;    } }     /**     * Hooks Shortcuts not in class     */    function add_action($hook,$function)    {        return Hook::add_action($hook,$function);    }     function do_action($hook)    {        return Hook::do_action($hook);    }    //添加钩子 Hook::add_action('unique_name_hook','some_class::hook_test'); //或使用快捷函数添加钩子:add_action('unique_name_hook','other_class::hello');add_action('unique_name_hook','some_public_function'); //执行钩子do_action('unique_name_hook');//也可以使用 Hook::do_action();
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