Form::sanitize_validate( boolean|array $fields = false )

	private function sanitize_validate( $fields = false ) {
		if ( ! ap_isset_post_value( $this->form_name . '_submit' ) ) {
			return;
		}

		if ( false === $this->prepared ) {
			$this->prepare();
		}

		if ( false === $fields ) {
			$fields = $this->fields;
		}

		foreach ( (array) $fields as $field ) {
			if ( ! empty( $field->child ) && ! empty( $field->child->fields ) ) {
				$this->sanitize_validate( $field->child->fields );
			}

			$field->sanitize();
			$field->validate();

			if ( true === $field->have_errors() ) {
				$this->add_error( 'fields-error', __( 'Error found in fields, please check and re-submit', 'anspress-question-answer' ) );
			}
		}
	}