Returns the string representation of the cache context.

A cache context service's name is used as a token (placeholder) cache key, and is then replaced with the string returned by this method.

Parameters

string|null $parameter: The parameter, or NULL to indicate all possible parameter values.

Return value

string The string representation of the cache context. When $parameter is NULL, a value representing all possible parameters must be generated.

Overrides CalculatedCacheContextInterface::getContext

File

core/lib/Drupal/Core/Cache/Context/CookiesCacheContext.php, line 26

Class

CookiesCacheContext

Defines the CookiesCacheContext service, for "per cookie" caching.

Namespace

Drupal\Core\Cache\Context

Code

public function getContext($cookie = NULL) {
  if ($cookie === NULL) {
    $cookies = $this->requestStack
      ->getCurrentRequest()->cookies
      ->all();
    // Sort the cookies by names, to always set the same context if the cookies
    // are the same but in a different order.
    ksort($cookies);
    // Use http_build_query() to get a short string from the cookies array.
    return http_build_query($cookies);
  }
  else {
    return $this->requestStack
      ->getCurrentRequest()->cookies
      ->get($cookie);
  }
}

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