创建文件 写文件
if (!is_dir($dir)) $this->mkDirs($dir);
$filePath4upload = $dir.DS.date("Y-m-d-H-i-s").'-test.txt';
$fileObj4upload = fopen($filePath4upload, "w") or die("Unable to open file!");
fwrite($fileObj4upload, "test qiniu config.");
fclose($fileObj4upload);