// falback to default or empty if no value in option
		if ( !isset($args['current']) ) {
			$args['current'] = isset( $args['default'] ) ? $args['default'] : '';
		} elseif ( empty($args['current']) && isset($args['default_if_empty']) && $args['default_if_empty'] == true ) { // force fallback if empty 'current' and 'default_if_empty' equals to true
			$args['current'] = isset( $args['default'] ) ? $args['default'] : '';
		}

		return $args;
	}

	/**
	 * Validate options.
	 *
	 * @param  array $input options to valid.
	 *
	 * @return array		validated options.
	 */
	public function validate( $input ) {
		// Create our array for storing the validated options.
		$output = array();

		if ( empty( $input ) || ! is_array( $input ) ) {
			return $input;
		}

		if ( ! empty( $input['wpo_wcpdf_setting_store_empty'] ) ) { //perhaps we should use a more unique/specific name for this
			foreach ( $input['wpo_wcpdf_setting_store_empty'] as $key ) {
				if ( empty( $input[$key] ) ) {
					$output[$key] = 0;
				}
			}
			unset($input['wpo_wcpdf_setting_store_empty']);
		}
	
		// Loop through each of the incoming options.
		foreach ( $input as $key => $value ) {
	
			// Check to see if the current option has a value. If so, process it.
			if ( isset( $input[$key] ) ) {
				if ( is_array( $input[$key] ) ) {
					foreach ( $input[$key] as $sub_key => $sub_value ) {
						$output[$key][$sub_key] = $input[$key][$sub_key];
					}
				} else {
					$output[$key] = $input[$key];
				}
			}
		}
	
		// Return the array processing any additional functions filtered by this action.
		return apply_filters( 'wpo_wcpdf_validate_input', $output, $input );
	}

	/**
	 * Appends language at the end of the setting provided, in case the setting is translatable
	 * and it does not have a language set.
	 *
	 * @param string $setting Settings field that needs a language.
	 * @param array  $args Setting arguments.
	 *
	 * @return string
	 */
	public function append_language( string $setting, array $args ): string {
		if (
			isset( $args['translatable'] ) &&
			true === $args['translatable'] &&
			isset( $args['lang'] )         &&
			'default' !== $args['lang']    &&
			! ( substr( $setting, -strlen( "[{$args['lang']}]" ) ) === "[{$args['lang']}]" )
		) {
			return $setting .= "[{$args['lang']}]";
		} else {
			return $setting;
		}
	}
}


endif; // class_exists