function delFile($dir, $fileName) { if ($fileName == "all") { $dirUtil = new DirUtil(); $fileList = $dirUtil->traverse($dir); foreach ($fileList as $f) { if (!unlink("{$dir}/{$f}")) { echo "false"; exit; } } echo "true"; } else { $ret = unlink("{$dir}/{$fileName}"); if ($ret) { echo "true"; } else { echo "false"; } } }