每次将新图像上传到文件夹时，都会向图像名称添加1

I am a newbie at PHP and I'm learning.

I've made a basic script where you can upload an image to a director on the server. I want the image names to get a number at the end so that the name won't be duplicated.

This is my script to add 1 to the name (I'm really bad at "for loops"):

for(x=0; $imageName => 50000; x++){
$imageFolderName = $imageName.$x;
}

Please tell me if I'm doing this totally wrong.

Here's a potential trick to avoid looping:

$existingfiles = count(glob("files/*"));
// this assumes you are saving in a directory called files!
$finalName = $imageName.$existingfiles;

Adding to Niet's answer, you can do a foreach loop on all the files in your folder and prepend a number to the file name like so:

<?
    $directory = 'directory_name';
    $files = array_diff(scandir($directory), array('.', '..'));
    $count = 0;

    foreach($files as $file)
    {
        $count++;
        rename($file, $count.'-'.$file);
    }
?>

Alternatively you could rename the file to the timestamp of when it was uploaded and prepend some random characters to the file with the rand() function:

<?
    $uploaded_name = 'generic-image.jpeg';
    $new_name = time().rand(0, 999).$uploaded_name;
?>

You'll need to handle and move the uploaded files before and after the rename, but you get the general gist of how this would work.