private function convertArgument($argument)
    {
        if (is_string($argument) && 0 < strlen($argument) && '@' === $argument[0]) {
            $argument = new Reference(substr($argument, 1));
        }

        return $argument;
    }
private function convertArgument($argument)
    {
        if (is_string($argument) && 0 < strlen($argument) && '@' === $argument[0]) {
            $argument = new Reference(substr($argument, 1));
        }

        return $argument;
    }
private function convertArgument ( $ argument ) { if ( is_string ( $ argument ) && 0 < strlen ( $ argument ) && '@' === $ argument [ 0 ] ) { $ argument = new Reference ( substr ( $ argument , 1 ) ) ; } return $ argument ; }
Converts a service string id into Reference if needed.

@param mixed $argument the argument we may convert

@return mixed the argument which may be converted
Converts a service string id into Reference if needed .