Form::get_fields_errors( false|array $fields = false )

	public function get_fields_errors( $fields = false ) {
		$errors = array();

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

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

		foreach ( (array) $fields as $field ) {
			if ( $field->have_errors() ) {
				$errors[ $field->id() ] = array( 'error' => $field->errors );
			}

			if ( ! empty( $field->child ) && ! empty( $field->child->fields ) ) {
				$child_errors = $this->get_fields_errors( $field->child->fields );

				if ( ! empty( $child_errors ) ) {
					$errors[ $field->id() ]['child'] = $child_errors;
				}
			}
		}

		return $errors;
	}