;
				break;
		}
	}

	/**
	 * Retrieve the name of the importer.
	 *
	 * @access private
	 *
	 * @param string $importer Either a string reported by the importer, the class name of the importer, or 'unknown'.
	 * @return string Name of the importer, or "Unknown Importer" if importer is unknown.
	 */
	private function get_importer_name( $importer ) {
		$importers = get_importers();
		return isset( $importers[ $importer ] ) ? $importers[ $importer ][0] : 'Unknown Importer';
	}

	/**
	 * Determine the class that extends `WP_Importer` which is responsible for
	 * the current action. Designed to be used within an action handler.
	 *
	 * @access private
	 * @static
	 *
	 * @return string The name of the calling class, or 'unknown'.
	 */
	private static function get_calling_importer_class() {
		// If WP_Importer doesn't exist, neither will any importer that extends it.
		if ( ! class_exists( 'WP_Importer', false ) ) {
			return 'unknown';
		}

		$action    = current_filter();
		$backtrace = debug_backtrace( false ); //phpcs:ignore PHPCompatibility.FunctionUse.NewFunctionParameters.debug_backtrace_optionsFound,WordPress.PHP.DevelopmentFunctions.error_log_debug_backtrace

		$do_action_pos = -1;
		$backtrace_len = count( $backtrace );
		for ( $i = 0; $i < $backtrace_len; $i++ ) {
			// Find the location in the stack of the calling action.
			if ( 'do_action' === $backtrace[ $i ]['function'] && $action === $backtrace[ $i ]['args'][0] ) {
				$do_action_pos = $i;
				break;
			}
		}

		// If the action wasn't called, the calling class is unknown.
		if ( -1 === $do_action_pos ) {
			return 'unknown';
		}

		// Continue iterating the stack looking for a caller that extends WP_Importer.
		for ( $i = $do_action_pos + 1; $i < $backtrace_len; $i++ ) {
			// If there is no class on the trace, continue.
			if ( ! isset( $backtrace[ $i ]['class'] ) ) {
				continue;
			}

			$class_name = $backtrace[ $i ]['class'];

			// Check if the class extends WP_Importer.
			if ( class_exists( $class_name, false ) ) {
				$parents = class_parents( $class_name, false );
				if ( $parents && in_array( 'WP_Importer', $parents, true ) ) {
					return $class_name;
				}
			}
		}

		// If we've exhausted the stack without a match, the calling class is unknown.
		return 'unknown';
	}
}