array( self::STANDARD => '{{name}} must contain only letters (a-z)', self::EXTRA => '{{name}} must contain only letters (a-z) and "{{additionalChars}}"', ), self::MODE_NEGATIVE => array( self::STANDARD => '{{name}} must not contain letters (a-z)', self::EXTRA => '{{name}} must not contain letters (a-z) or "{{additionalChars}}"', ), ); public function chooseTemplate() { return $this->getParam('additionalChars') ? static::EXTRA : static::STANDARD; } }