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                tp5.1中取消了系統常量的設置,很多模板公用的信息(網站標題、靜態文件目錄)無法通過以前的方式來渲染。本文主要介紹利用后置中間件去實現一些公用信息的渲染。 首先,我們配置好中間件,并注冊一個后置中間件,具體介紹見[中間件 · ThinkPHP5.1完全開發手冊 · 看云](http://www.hmoore.net/manual/thinkphp5_1/564279) 我注冊的后置中間件為`After`,代碼如下: ``` namespace app\http\middleware; class After { public function handle($request, \Closure $next) { $response = $next($request); // 添加中間件執行代碼 app('app\common\lib\AppConst'); return $response; } } ``` 此處的`app\common\lib\AppConst`即我們自定義的一個執行公用信息渲染的類,代碼如下 ``` use app\common\model\AppConfig; use think\facade\Cache; use think\facade\View; class AppConst { protected $defaultAssign = []; public function __construct() { $this->getConfig(); $this->getActionConfig(); View::share($this->defaultAssign); } /** * 獲取應用基礎配置,如網站名稱、靜態文件目錄等 * @return $this */ protected function getConfig() { $config = Cache::remember('app_config',function(){ return AppConfig::defaultAssign()->select(); },0); $configAssign = []; foreach ($config as $value){ $configAssign['app_config'][$value['config_name']] = $value['config_value']; } $this->defaultAssign = array_merge($this->defaultAssign,$configAssign); return $this; } protected function getActionConfig() { //獲取當前請求action的信息 } } ``` 這樣,我們就實現了通過后置中間件的方式自動渲染一些公用信息。這樣的設計是不是既優雅又方便。
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