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1<?php
2
3namespace Drupal\visitors;
4
5/**
6 * Interface for tacking cookies.
7 *
8 * @package Drupal\visitors
9 */
10interface VisitorsCookieInterface {
11
12  /**
13   * Returns the visitor id from the cookie.
14   *
15   * @return string|null
16   *   The visitor id.
17   */
18  public function getId(): ?string;
19
20}