Phalcon\Cache\Backend\Aerospike::decrement PHP Method

    public function decrement($keyName = null, $value = null)
    {
        if (!$value) {
            $value = -1;
        } elseif ($value > 0) {
            $value = -1 * abs($value);
        }
        return $this->increment($keyName, $value);
    }