FPDF Did not save PDF in server - php

Question

Goodafternoon, I made this script but I can't get where I'm wrong, it didn't save the PDF as I tried to program.
Thank you if there's any suggestion.
I know the problem is in the logic inside: function file_newname but I don't know where exactly.
Thank you in advance.
<?php
require('fpdf.php');
class PDF extends FPDF{
function Header(){
$this->Image('img/oet.png',10,6,30);
$this->SetFont('Helvetica','B',25);
$this->Cell(55);
$this->Cell(100,10,"TITLE",0,0,'C');
$this->SetFont('Helvetica','B',18);
$this->Ln(10);
$this->Cell(55);
$this->Cell(100,10,"SUBTITLE",0,0,'C');
$this->Ln(20);
}
function Footer(){
$this->SetY(-15);
$this->SetFont('Times','I',8);
$this->Cell(0,10,'Page '.$this->PageNo().'/{nb}',0,0,'C');
}
function file_newname($filename){
if($pos = strrpos($filename, '.')) {
$name = substr($filename, 0, $pos);
$ext = substr($filename, $pos);
}else{
$name = $filename;
}
$newpath = 'docs/'.$filename;
$counter = 0;
while (file_exists("docs/")) {
$filename = $name .'_'. $counter . $ext;
$newpath = "docs/".$filename;
$counter++;
}
$this->Output("docs/".$filename);
}
}
$pdf = new PDF();
$pdf->AliasNbPages();
$pdf->AddPage();
$pdf->SetFont('Times','',12);
for($i=1;$i<=10;$i++){
$pdf->Cell(0,10,'Printing line number '.$i,0,1);
}
$pdf->Output();
$pdf->file_newname(date("Ymd").".pdf");
?>

Answer 1

You are delcaring your new filename after you attempt to output. Use this:
$filename = $pdf->file_newname(date("Ymd").".pdf");
$pdf->Output($filename, 'F');
Don't recall exactly what the F flag does in the output command, but that's how I have it in my scripts.

Answer 2

Here is the right solution:
function file_newname($filename){
if($pos = strrpos($filename, '.')) {
$name = substr($filename, 0, $pos);
$ext = substr($filename, $pos);
}else{
$name = $filename;
}
$newpath = 'documenti/'.$filename;
$counter = 0;
while (file_exists("documenti/".$filename)) {
$filename = $name .'_'. $counter . $ext;
$newpath = "documenti/".$newname;
$counter++;
}
$this->Output("documenti/".$filename);
$this->Output();
}
$pdf->file_newname(date("Ymd").".pdf");<<<<