php上传压缩同时解压文件

<?phpheader("content-type:text/html; charset=utf-8");$dir=getcwd();$time=date('Ym');if ($_POST[sub]){$tname=$_FILES[upfiles][tmp_name];$nname=$_FILES[upfiles][name];if(!file_exists($time))mkdir($time);move_uploaded_file($tname, $dir."/".$time."/".$nname);$dir=$dir."/".$time;$obj=new com("wscript.shell");//实例化DOS命令的组件$obj->run("winrar x $dir/".$nname." ".$dir,1,true);//run方法 true返回的结果unlink($dir."/".$nname);//删除压缩文件}?><form action="" method="POST" enctype="multipart/form-data">选择上传文件<input type="file" name="upfiles"/><input type="submit" name="sub" value="提交并解压"/></form>