static function Sanitize($input, $type)
 {
    switch($type)
    {
       case Sanitizer::ALPHANUMERIC:
          return Sanitizer::SanitizeAlphanumeric($input);
          break;
       case Sanitizer::NUMERIC:
          return Sanitizer::SanitizeNumeric($input);
          break;            
    }
    throw new Exception('Unsupported sanitation type.');
 }