如果已存在具有该名称的图像，则将数字附加到文件名

Question

I wrote some php that checks if a file already exists when a user uploads a new file, and if so appends a string to the filename. What I want is that a number is added to the end of the filename and when another file with the same name is uploaded it tops the number by 1.

So for example: I already have an image uploaded with filename image.png and I upload another one with the same filename. That file should be renamed to image0.png. When I try to upload another image with filename image.png it should be renamed to image1.png and so on.

I'm not sure how to accomplish this within my code. Can anyone help me out? This is the code snippet that checks for duplicates and appends something to the filename.

if(file_exists("/customers/d/8/e/frankkluytmans.nl/httpd.www/testsite/cms/upload/".$_FILES["image"]["name"]))
{
    $filename = explode(".",$_FILES['image']['name']);
    $imageName = $filename[0]."hoi.".$filename[1];
}
else
{
    $imageName = $_FILES['image']['name'];
}

$image = mysql_real_escape_string(htmlspecialchars("/upload/".$imageName));

if (move_uploaded_file($_FILES["image"]["tmp_name"],     "./upload/".$imageName)) {�

mysql_query("INSERT frankkluytmans SET pagid='$pagid', title='$titlename', content='$contentname', image='$image', youtube='$youtube'")
or die(mysql_error()); 

header("Location: index.php"); 

}

Answer 1

You could use a recursive function to keep checking the number:

function checkFile($path, $file, $ext, $number)
{
    if(file_exists($path.$file.$number.$ext))
    {
        if($number == "")
            $number = 0;

        $number ++;
        return checkFile($path, $file, $ext, $number);
    }

    return $path.$file.$number.$ext;
}

//run mime type things to get extension. for now lets pretend it is .jpg
// and assume you stripped the extension from the uploaded file...
// also, pass blank to last param to start the file check without a number.

$extension = ".jpg";
$filename_minus_extension = "some-image";

$filename = checkFile('path-to-directory/', $filename_minus_extension, $extension, "");

This is in no way tested, but the general idea is to use a recursive function. If you have a specific question, feel free to ask and I may update.