Cache.php
public function delete($key)
    {
        if ($this->isSafe() && !empty($key)) {
            return $this->client->delete($key);
        }

        return false;
    }
public function delete($key)
    {
        if ($this->isSafe() && !empty($key)) {
            return $this->client->delete($key);
        }

        return false;
    }
Delete a key from the cache

@param string $key Unique key
@access public
@return void