$lmD = new Directory();
 $lmD->setBasePath('/usr/local/var/www/');
 $lmD->buildPath('img/a' , 0755);
 $lmD->buildPath('img/b' , 0755);
 $lmD->buildPath('img/c' , 0755);
 $lmD->buildFile('img/a/a.txt' , 0755);
 $lmD->buildFile('img/b/b.txt' , 0755);
 $lmD->buildFile('img/c/c.txt' , 0755);
 $lmD->removeDirs('img/' , ['a']);//img目录下除了a以外其他全部删除掉

$time = time();
$date = date('YmdH' , $time);
$fileName = 'tmp' . $time  . rand(100 , 999). '.html';
$directory =  new Directory();
$directory->file = new File();
$directory->setBasePath(Yii::getAlias('@vendor') . '/liumapp/dompdf/www/data');
$directory->buildPath($date);
$directory->buildFile($date . '/' . $fileName);
$directory->file->setFileName($directory->getAbsolutPath($date . '/' . $fileName));

$string = 'this is the one must be done';
$directory->file->open()->write($string);