public CacheCollectorInterface::set($key, $value)
Sets cache data.
It depends on the specific case and implementation whether this has a permanent effect or if it just affects the current request.
string $key: Key that identifies the data.
mixed $value: The data to be set.
public function set($key, $value);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Cache!CacheCollectorInterface.php/function/CacheCollectorInterface::set/8.1.x