public FileSystemInterface::mkdir($uri, $mode = NULL, $recursive = FALSE, $context = NULL)
Creates a directory, optionally creating missing components in the path to the directory.
When PHP's mkdir() creates a directory, the requested mode is affected by the process's umask. This function overrides the umask and sets the mode explicitly for all directory components created.
@todo Update with open_basedir compatible recursion logic from \Drupal\Component\PhpStorage\FileStorage::ensureDirectory().
string $uri: A URI or pathname.
int $mode: Mode given to created directories. Defaults to the directory mode configured in the Drupal installation. It must have a leading zero.
bool $recursive: Create directories recursively, defaults to FALSE. Cannot work with a mode which denies writing or execution to the owner of the process.
resource $context: Refer to http://php.net/manual/ref.stream.php
bool Boolean TRUE on success, or FALSE on failure.
mkdir()
https://www.drupal.org/node/515192
public function mkdir($uri, $mode = NULL, $recursive = FALSE, $context = NULL);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!File!FileSystemInterface.php/function/FileSystemInterface::mkdir/8.1.x