if($DB->next_record()) {
  ...
} else {
  ...
}

D:\wamp\php>php -h
Usage: php [options] [-f] <file> [--] [args...]
       php [options] -r <code> [--] [args...]
       php [options] [-B <begin_code>] -R <code> [-E <end_code>] [--] [args...
       php [options] [-B <begin_code>] -F <file> [-E <end_code>] [--] [args...
       php [options] -- [args...]
       php [options] -a

  -a               Run interactively
  -c <path>|<file> Look for php.ini file in this directory
  -n               No php.ini file will be used
  -d foo[=bar]     Define INI entry foo with value 'bar'
  -e               Generate extended information for debugger/profiler
  -f <file>        Parse <file>.
  -h               This help
  -i               php information
  -l               Syntax check only (lint)
  -m               Show compiled in modules
  -r <code>        Run php <code> without using script tags <?..?>
  -B <begin_code>  Run php <begin_code> before processing input lines
  -R <code>        Run php <code> for every input line
  -F <file>        Parse and execute <file> for every input line
  -E <end_code>    Run php <end_code> after processing all input lines
  -H               Hide any passed arguments from external tools.
  -s               Display colour syntax highlighted source.
  -v               Version number
  -w               Display source with stripped comments and whitespace.
  -z <file>        Load Zend extension <file>.

  args...          Arguments passed to script. Use -- args when first argument
                   starts with - or script is read from stdin