Rename a file if same already exists - php

Question

I'm trying to upload a file and rename it if it already exists.
The way I want i to do is that when det same file uploads the name just adds 1, then 2, then 3, and so on.
Example: If file "file" exists, the new file should be "file1", then the next one "file2".
I've seen some examples on the net, but nothing that I could see fit to my code (noob)
This is my code now:
$id = $_SESSION['id'];
$fname = $_FILES['dok']['name'];
if ($_FILES['dok']['name'] !=""){
// Checking filetype
if($_FILES['dok']['type']!="application/pdf") {die("You can only upload PDF files");}
// Checking filesize
if ($_FILES['dok']['size']>1048576) {die("The file is too big. Max size is 1MB");}
// Check if user have his own catalogue
if (file_exists("filer/".$id."/")) {
// Moving the file to users catalogue
move_uploaded_file($_FILES['dok']['tmp_name'],"filer/".$id."/".$fname);}
//If user don't have his own catalogue
else {
// Creates new catalogue then move the file in place
mkdir("filer/".$id);
move_uploaded_file($_FILES['dok']['tmp_name'],"filer/".$id."/".$fname); } }
Can somebody help me where I can put in code that solves this problem?
Big thank you!

Answer 1

$id = $_SESSION['id'];
$fname = $_FILES['dok']['name'];
if ($_FILES['dok']['name'] !=""){
// Checking filetype
if($_FILES['dok']['type']!="application/pdf") {
die("You can only upload PDF files");
}
// Checking filesize
if ($_FILES['dok']['size']>1048576) {
die("The file is too big. Max size is 1MB");
}
if(!is_dir("filer/".$id."/")) {
mkdir("filer/".$id);
}
$rawBaseName = pathinfo($fname, PATHINFO_FILENAME );
$extension = pathinfo($fname, PATHINFO_EXTENSION );
$counter = 0;
while(file_exists("filer/".$id."/".$fname)) {
$fname = $rawBaseName . $counter . '.' . $extension;
$counter++;
};
move_uploaded_file($_FILES['dok']['tmp_name'],"filer/".$id."/".$fname);
}
But don't forget to secure your script (eg see comment of Marc B above) and maybe you could optimize some more ;-)

Answer 2

so if folder exists:
file_exists("filer/".$id."/")
check if file exists
file_exists("filer/".$id."/".$fname)
and then if it does,
$fname = $fname . "(1)" // or some appending string
So in the end you change your code to:
// Check if user have his own catalogue
if (file_exists("filer/".$id."/")) {
while (file_exists("filer/".$id."/".$fname)) // Now a while loop
$fname = "copy-" . $fname; // Prepending "copy-" to avoid breaking extensions
// Moving the file to users catalogue
move_uploaded_file($_FILES['dok']['tmp_name'],"filer/".$id."/".$fname);}
//If user don't have his own catalogue
else {

Answer 3

<form action="test.php" method="post" enctype="multipart/form-data">
Select file to upload:
<input type="file" name="fileToUpload" id="fileToUpload">
<input type="submit" value="Upload File" name="submit">
</form>
<?php
$id = $_SESSION['id'];
$fname = $_FILES['fileToUpload']['name'];
// Checking filesize
if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], "uploads/".$id."/".$fname)) {
echo "The file ". basename( $_FILES["fileToUpload"]["name"]). " has been uploaded.";
}else {
echo "Sorry, there was an error uploading your file.";
}
// Check file size$
if ($_FILES['fileToUpload']['size']>1048576) {
die("The file is too big. Max size is 1MB");
}
if(!is_dir("uploads/".$id."/")) {
mkdir("uploads/".$id);
}
$rawBaseName = pathinfo($fname, PATHINFO_FILENAME );
$extension = pathinfo($fname, PATHINFO_EXTENSION );
$counter = 0;
while(file_exists("uploads/".$id."/".$fname)) {
$fname = $rawBaseName . $counter . '.' . $extension;
$counter++;
};
move_uploaded_file($_FILES['fileToUpload'] ['tmp_name'],"uploads/".$id."/".$fname);
?>