File::isFolder() 

\nn\t3::File()->isFolder($file); 

Returns whether the specified path is a folder

Example:

\nn\t3::File()->isFolder('fileadmin'); // => returns true
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| @return boolean

Source Code 

public function isFolder($file)
{
	if (substr($file, -1) == '/') return true;
	return is_dir($this->absPath($file));
}
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