File::mkdir() 

\nn\t3::File()->mkdir($path = ''); 

Create a folder

\nn\t3::File()->mkdir( 'fileadmin/my/folder/' );
\nn\t3::File()->mkdir( '1:/my/folder/' );
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| @return boolean

Source Code 

public function mkdir($path = '')
{
	if (\nn\t3::File()->exists($path)) return true;
	$path = \nn\t3::File()->absPath(rtrim($path, '/') . '/');
	\TYPO3\CMS\Core\Utility\GeneralUtility::mkdir_deep($path);
	return \nn\t3::File()->exists($path);
}
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