Rename a file if same already exists

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 {