public StreamWrapperInterface::dirname($uri = NULL)
Gets the name of the directory from a given path.
This method is usually accessed through drupal_dirname(), which wraps around the normal PHP dirname() function, which does not support stream wrappers.
string $uri: An optional URI.
string A string containing the directory name, or FALSE if not applicable.
public function dirname($uri = NULL);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!StreamWrapper!StreamWrapperInterface.php/function/StreamWrapperInterface::dirname/8.1.x