public AliasManagerInterface::cacheClear($source = NULL)
Clear internal caches in alias manager.
$source: Source path of the alias that is being inserted/updated. Can be omitted if entire cache needs to be flushed.
public function cacheClear($source = NULL);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Path!AliasManagerInterface.php/function/AliasManagerInterface::cacheClear/8.1.x