function renameFile($oldname,$newname){
??? echo $oldname,$newname;
}

elseif ($act=="renameFile"){
??????????? //完成重命名
??????????? $str=<<<EOF
??????????????? <form action="index.php?act=doRename" method="post" >
??????????? 請填寫新文件名：<input type="text" name="newname" placeholder="重命名" /><br/>
??????????? <input type='hidden' name='filename' value='{$filename}' />
??????????? <input type="submit" value="重命名">
??????????? </form>
EOF;
??????????? echo $str;
??????? }elseif ($act=="doRename"){

??????????? //實現重命名的操作
??????????? $newname=$_REQUEST['newname'];
??????????? renameFile($filename, $newname);
????????
??????? }