public function validate_fields( $posted_data, $fields ) {

		if ( empty( $posted_data ) && ! empty( $fields ) ) {
			return new WP_Error( 'llms-form-no-input', __( 'Cannot validate a form with no user input.', 'lifterlms' ) );
		}

		$err      = new WP_Error();
		$err_data = array();
		foreach ( $fields as $field ) {

			if ( empty( $field['name'] ) || empty( $posted_data[ $field['name'] ] ) ) {
				continue;
			}

			$valid = $this->validate_field( $posted_data[ $field['name'] ], $field );
			if ( is_wp_error( $valid ) ) {
				$err->add( $valid->get_error_code(), $valid->get_error_message() );
				$err_data[ $field['name'] ] = $field;
			}
		}

		if ( $err->errors ) {
			$err->add_data( $err_data );
			return $err;
		}

		return true;

	}