sebastianfeldmann / phpbu

     * @throws \RuntimeException

     * @return int

     */

    public static function toBytes($value)

    {

        if (!preg_match('#^[0-9]*[BKMGT]$#i', $value)) {

            throw new RuntimeException('Invalid size value');

        }

        $units  = ['B' => 0, 'K' => 1, 'M' => 2, 'G' => 3, 'T' => 4, 'P' => 5];

        $unit   = strtoupper(substr($value, -1));

        $number = intval(substr($value, 0, -1));

        return $number * pow(1024, $units[$unit]);

    }

    /**

     * Return time in seconds for a given value.

     * @throws \RuntimeException

     * @return integer

     */

    public static function toTime($offset)

    {

        if (!preg_match('#^[1-9]+[0-9]*[SIHDWMY]$#i', $offset)) {

            throw new RuntimeException(sprintf('Invalid value for offset: %s', $offset));

        }

        $units  = ['S' => 1, 'I' => 60, 'H' => 3600, 'D' => 86400, 'W' => 604800, 'M' => 2678400, 'Y' => 31536000];

        $unit   = strtoupper(substr($offset, -1));

        $number = intval(substr($offset, 0, -1));

        return $number * $units[$unit];

    }

    /**

     * Pads all given strings to given length.