yii2_缓存依赖

‘cache‘ => [
            ‘class‘ => ‘yii\caching\FileCache‘,
        ],

//表达式依赖  
$dp = new ExpressionDependency([
                ‘expression‘ => ‘count(Yii::$app->authManager->getPermissionsByUser(Yii::$app->user->id))‘
            ]);
//数据库依赖(sql)  
$dp2 = new DbDependency([
                ‘sql‘ => ‘select max(updated_at) from auth_item‘,
            ]);
//链式依赖(把以上2个依赖串起来，任何一个发生变化都会使缓存失效)  
Yii::$app->cache->set($key, $value, 0, new ChainedDependency([
                ‘dependencies‘ => [$dp, $dp2]
            ]));