deleting all files from a folder using php?

 function recursiveDelete($str){
        if(is_file($str)){
            return @unlink($str);
        }
        elseif(is_dir($str)){
            $scan = glob(rtrim($str,'/').'/*');
            foreach($scan as $index=>$path){
                $this->recursiveDelete($path);
            }
            return @rmdir($str);
        }
    }