think\Hook::add PHP Method

    public static function add($tag, $behavior, $first = false)
    {
        isset(self::$tags[$tag]) || (self::$tags[$tag] = []);
        if (is_array($behavior) && !is_callable($behavior)) {
            if (!array_key_exists('_overlay', $behavior) || !$behavior['_overlay']) {
                unset($behavior['_overlay']);
                self::$tags[$tag] = array_merge(self::$tags[$tag], $behavior);
            } else {
                unset($behavior['_overlay']);
                self::$tags[$tag] = $behavior;
            }
        } elseif ($first) {
            array_unshift(self::$tags[$tag], $behavior);
        } else {
            self::$tags[$tag][] = $behavior;
        }
    }

 public function run(&$parms)
 {
     //安装时不执行
     if (defined('BIND_MODULE') && BIND_MODULE === 'Install') {
         return;
     }
     $data = S('global_hooks');
     if (!$data) {
         $hooks = M('Hooks', "common_")->getField('name,addons');
         foreach ($hooks as $key => $value) {
             if ($value) {
                 $map['status'] = 1;
                 $names = explode(',', $value);
                 $map['name'] = array('IN', $names);
                 $data = M('Addons', "common_")->where($map)->getField('id,name');
                 if ($data) {
                     $addons = array_intersect($names, $data);
                     Hook::add($key, array_map('get_addon_class', $addons));
                 }
             }
         }
         S('global_hooks', Hook::get());
     } else {
         Hook::import($data, false);
     }
 }