Automattic / jetpack

		}

		switch ( $field_type ) {

			case 'email':

				// Make sure the email address is valid

				if ( ! is_string( $field_value ) || ! is_email( $field_value ) ) {

					/* translators: %s is the name of a form field */

					$this->add_error( sprintf( __( '%s requires a valid email address', 'jetpack' ), $field_label ) );

				}

				break;

			case 'checkbox-multiple':

				// Check that there is at least one option selected

				if ( empty( $field_value ) ) {

					$this->add_error( sprintf( __( '%s requires at least one selection', 'jetpack' ), $field_label ) );

				}

				break;

			default:

				// Just check for presence of any text

				if ( ! is_string( $field_value ) || ! strlen( trim( $field_value ) ) ) {

					/* translators: %s is the name of a form field */

					$this->add_error( sprintf( __( '%s is required', 'jetpack' ), $field_label ) );

				}

		}

	}