src/Cache/Driver/FileCacheDriver.php
function get($key = '')
    {
        $cache_file = $this->cache_path . $key;
        if (!file_exists($cache_file)) {
            return false;
        }

        return file_get_contents($cache_file);
    }
function get($key = '')
    {
        $cache_file = $this->cache_path . $key;
        if (!file_exists($cache_file)) {
            return false;
        }

        return file_get_contents($cache_file);
    }
返回缓存文件

@param string $key
@return mixed