src/Shared/Message/Mapping/MappingTrait.php
protected static function getMessage(/*# int */ $code)/*# : string */
    {
        $mapping = static::getMappings();
        if (isset($mapping[$code])) {
            return $mapping[$code];
        }
        return (string) $code;
    }
protected static function getMessage(/*# int */ $code)/*# : string */
    {
        $mapping = static::getMappings();
        if (isset($mapping[$code])) {
            return $mapping[$code];
        }
        return (string) $code;
    }
Resolving code for current message class, from cache or default

If nothing found, return the code anyway

@param  int $code the message code
@return string
@access protected