Yii2 使用页面缓存 [ 2.0 版本 ]

起初使用页面缓存，发现使用于含有参数的方法存在弊端，只能缓存第一次的页面，导致后面所有不同参数的页面均显示第一次缓存页面；没有生成一个参数页面一个缓存；于是，进行了重写页面缓存。

<?php 


namespace common\lib;

use Yii;
use yii\caching\Cache;
use yii\di\Instance;
use yii\web\Response;
use yii\filters\PageCache as PCache;


/**
* 重写页面缓存，增加varByParam参数一列
*/
class PageCache extends PCache
{
	/**
	 * 参数设置，默认无参数
	 * 用法：'varByParam' => Yii::$app->request->get('id')
	 * @var string
	 */
	public $varByParam = '';

	public function beforeAction($action)
    {
        if (!$this->enabled) {
            return true;
        }

        $this->cache = Instance::ensure($this->cache, Cache::className());

        if (is_array($this->dependency)) {
            $this->dependency = Yii::createObject($this->dependency);
        }

        $properties = [];
        foreach (['cache', 'duration', 'dependency', 'variations'] as $name) {
            $properties[$name] = $this->$name;
        }
        $id = $this->varyByRoute ? $action->getUniqueId().$this->varByParam : __CLASS__;
        $response = Yii::$app->getResponse();
        ob_start();
        ob_implicit_flush(false);
        if ($this->view->beginCache($id, $properties)) {
            $response->on(Response::EVENT_AFTER_SEND, [$this, 'cacheResponse']);
            return true;
        } else {
            $data = $this->cache->get($this->calculateCacheKey());
            if (is_array($data)) {
                $this->restoreResponse($response, $data);
            }
            $response->content = ob_get_clean();
            return false;
        }
    }
}
 ?>

使用：

[
'class' => 'common\lib\PageCache',
            'only' => ['view'],
            'duration' => 0, //永不过期
            'varByParam' => Yii::$app->request->get('id'),
],

如有不同做法欢迎指正；谢谢！