src/PluginManager.php
protected function loadCache()
    {
        if ($this->cacheDuration === false) {
            return [];
        }

        return $this->serializer->unpack($this->app->cache->get($this->buildCacheKey()));
    }
protected function loadCache()
    {
        if ($this->cacheDuration === false) {
            return [];
        }

        return $this->serializer->unpack($this->app->cache->get($this->buildCacheKey()));
    }
Loads items from the cache. The key is generated automatically using [[buildCacheKey()]].

@return array

@see buildCacheKey()