Can not rename a folder inside $_POST - php

Question

I browsed many references in this site and found that this works successfully:
<?php
//tes to rename a sub folder
$oldDir="test";
$newDir = "testing";
if (!is_dir(dirname($newDir))) {
mkdir(dirname($newDir), 0777, true);
}
rename($oldDir,$newDir);
echo 'successfully renamed into';
?>
Now,I need to rename a category label (directory). But, It gave me error:
"warning"."No such file or directory in ...." when I have a category name inside $_POST, as in illustrated below:
First, submit.php
<?php
$displCat = $mydb->prepare("SELECT * FROM labelz ORDER BY label_name");
$displCat->execute();
$dataCat = $displCat->fetchAll();
foreach ($dataCat as $tampil_cat) {
$idcat=$tampil_cat['id'];
$cat=$tampil_cat['label_name'];
?>
<form action="u.php?id=<?php echo $idcat; ?>" method="post" name="frmupdatekat">
<div class="modal-body" style="overflow:auto;">
<h4>Edit Kategori: <?php echo $idcat.". ".$cat; ?></h4>
<input type="text" class="form-control" id="txtOldKat" name="txtOldKat" value="<?php echo $cat; ?>" style="border:0px;"/>
<input type="text" class="form-control" id="txtUpdateKategori" name="txtUpdateKategori"/>
<br />
<input type="submit" name="cmdUpdateKategori" id="cmdUpdateKategori" class="btn btn-success" style="vertical-align:middle; height:27px; padding:4px; font:12px Arial;" value="Update Kategori"/>
<br />
<br />
</div>
</form>
//.......
?>
Second, u.php
<?php
session_start();
include('conn.php');
if (isset($_GET['id'])){
$id=isset($_GET['id']) ? $_GET['id'] : '';
$txtOldKat=trim($_POST['txtOldKat']);
$txtUpdateKategori=trim($_POST['txtUpdateKategori']);
rename($txtOldKat,$txtUpdateKategori);
echo "<script>alert('Haadeeeehhh, ini koq error muluuuuuuuuuuuu!');</script>";
exit(); // stop to see if errors here.
if (isset($_POST['cmdUpdateKategori'])){
if (empty($_POST['txtUpdateKategori'])){
echo "<script>alert('Admin, Anda belum mengganti nama Kategori!');</script>";
echo "<meta http-equiv='refresh' content='0; url=adminz/kategori.php?target=kategori'>";
exit();
}
else{
$sql="SELECT * FROM labelz WHERE id=:id";
$sth = $mydb->prepare($sql);
$sth->execute(array(':id' => $id ));
//....... others code
?>
I then used previous scripts but not work even to use:
__DIR__
__dirname(__FILE__)
realpath()
etc.
I also check if the $old_cat exists and it really exists.
Here's the screenshot from filezilla (and also check in cpanel).
Then try using trim() in post value.
I also read here: http://php.net/manual/en/function.rename.php to see if I was wrong.
It seems, it doesn't work inside $_POST.
So, What should I do since I need it to do inside that $_POST.
Otherwise, you may have other solution to.
If you find this is duplicate question, pls let me know the link.
Thanks a lot for your advice/suggestion/solution.

Answer 1

Do some error checks in your code, make sure $old_cat exists prior to renaming, make sure $new_cat is in fact a valid file/folder name and doesn't already exist, make sure $old_cat and $new_cat are actually set.