Convert.php

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<?php

class Robo47_Convert
{

    public static function shortHandToBytes($value)
    {
        if (is_numeric($value)) {
            if ($value >= PHP_INT_MAX) {
                $message = 'input is greater than PHP_INT_MAX on this ' .
                    'plattform (' . PHP_INT_MAX . ')';
                throw new Robo47_Convert_Exception($message);
            }
            return (int) $value;
        } else {
            $lastSign = strtolower($value{strlen($value) - 1});
            $valueBytes = (int) mb_substr($value, 0, strlen($value) - 1);
            switch ($lastSign) {
                case 'k':
                    $valueBytes *= 1024;
                    break;
                case 'm':
                    $valueBytes *= 1024 * 1024;
                    break;
                case 'g':
                    $valueBytes *= 1024 * 1024 * 1024;
                    break;
                default:
                    $message = 'invalid last sign in ' . $value;
                    throw new Robo47_Convert_Exception($message);
                    break;
            }
            if ($valueBytes >= PHP_INT_MAX) {
                $message = 'input is greater than PHP_INT_MAX on this ' .
                    'plattform (' . PHP_INT_MAX . ')';
                throw new Robo47_Convert_Exception($message);
            }
            return $valueBytes;
        }
    }
}