Cache.php
public function get($filename, array $conditions = array())
    {
        if ($this->exists($filename, $conditions)) {
            return file_get_contents($this->getCacheFile($filename, true));
        } else {
            return null;
        }
    }
public function get($filename, array $conditions = array())
    {
        if ($this->exists($filename, $conditions)) {
            return file_get_contents($this->getCacheFile($filename, true));
        } else {
            return null;
        }
    }
Get data from the cache

@param string $filename the cache file name
@param array $conditions
@return null|string