From http://rosstuck.com/formatting-exception-messages/

exception.php

class InvalidRowException extends \Exception
{
    // One off error messages can use this method...
    public static function create(Row $row, $reason)
    {
        return new static("Row " . $row->getIndex() . " is invalid because: " . $reason);
    }

    // ...and predefined methods can use it internally.
    public static function blankLine(Row $row)
    {
        return static::create($row, "Is a blank line.");
    }
}