SugiPHP / Cache

     *

     * @return integer|false Returns the new incremented value or FALSE on failure

     */

    public function inc($key, $step = 1)

    {

        $key = $this->prefix.$key;

        if ($this->driver instanceof IncrementorInterface) {

            return $this->driver->inc($key, $step);

        }

        $value = $this->driver->get($key);

        if (is_null($value) || !is_numeric($value)) {

            return false;

        }

        $newValue = $value + $step;

        return ($this->driver->set($key, $newValue)) ? $newValue : false;

    }

    /**

     * Decrements numeric item's value.

     *

     * @return integer|false Returns the new decremented value or FALSE on failure

     */

    public function dec($key, $step = 1)

    {

        $key = $this->prefix.$key;

        if ($this->driver instanceof IncrementorInterface) {

            return $this->driver->dec($key, $step);

        }

        $value = $this->driver->get($key);

        if (is_null($value) || !is_numeric($value)) {

            return false;

        }

        $newValue = $value - $step;

        return ($this->driver->set($key, $newValue)) ? $newValue : false;

    }

}