delete a new line from the txt file after inserting the value

I create a txt file from a folder in that way:

$fp = fopen("mylist.txt","rw+");
foreach(glob("folder/*.*") as $value){
fwrite($fp,$value."\n");
}

and it create inside the txt each items, one per line, BUT it also add a newline at the end of the file.

This is the content of mylist.txt:

foldelr/file1.mp3
folder/file2.mp3
(BLANK NEWLINE)

I tried to remove the blank newline at the end of the txt file, in this way:

$filetxt = fopen("mylist.txt","r");
$rtrim = rtrim($filetxt, "\n");
$newfile = file_put_contents("newfile.txt", $rtrim);

But it doesn't work, because in the "newfile.txt", i still have the newline blank after last file name.

I tried to convert file in array, use "array_diff()" to remove the last line, but it fail. I tried also all the suggestions in this thread: remove new line characters from txt file using php but not fix my problem.

Does anyone can please help me to understand what i'm missing or mistaken?

Kind Regards

Brus

---

Use file_get_contents method it works fine for me

    $fp = fopen("mylist.txt","rw+");
    foreach (glob("test/*.*") as $value) {
        fwrite($fp, $value . "\n");
    }

    $filetxt = file_get_contents("mylist.txt");
    $rtrim =  rtrim($filetxt, "\n");
    $newfile = file_put_contents("mylist.txt", $rtrim);

Or You can also remove the last newline by using the array count.

$fp = fopen("mylist.txt","rw+");
$i =0;
foreach(glob("folder/*.*") as $value){
  $i++;
  if($i < count(glob("folder/*.*")))
    fwrite($fp,$value."\n");
  else
    fwrite($fp,$value);
}