private function validate($port): ?int
    {
        $port = $this->filterComponent($port);
        if (null === $port) {
            return null;
        }

        $fport = filter_var($port, FILTER_VALIDATE_INT, ['options' => ['min_range' => 0]]);
        if (false !== $fport) {
            return $fport;
        }

        throw new SyntaxError(sprintf('Expected port to be a positive integer or 0; received %s', $port));
    }
private function validate($port): ?int
    {
        $port = $this->filterComponent($port);
        if (null === $port) {
            return null;
        }

        $fport = filter_var($port, FILTER_VALIDATE_INT, ['options' => ['min_range' => 0]]);
        if (false !== $fport) {
            return $fport;
        }

        throw new SyntaxError(sprintf('Expected port to be a positive integer or 0; received %s', $port));
    }
private function validate ( $ port ) : ? int { $ port = $ this -> filterComponent ( $ port ) ; if ( null === $ port ) { return null ; } $ fport = filter_var ( $ port , FILTER_VALIDATE_INT , [ 'options' => [ 'min_range' => 0 ] ] ) ; if ( false !== $ fport ) { return $ fport ; } throw new SyntaxError ( sprintf ( 'Expected port to be a positive integer or 0; received %s' , $ port ) ) ; }
Validate a port.

@throws SyntaxError if the port is invalid
Validate a port .