php and moving images to new folders

I have an image in my templates folder that is made using php with a background template .jpg (stored in the s开发者_如何学Pythoname folder) and some text submitted from a form. It is saved as a jpg in this folder. I want to copy the php-constructed image to a folder uploads, and then rename it as image451.jpg, or whatever the id number is. I think I should use the copy() and rename() php functions, but I can't get them to work. How do I do this?

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You will need to be sure that your web server has write access to the uploads directory where you want them to reside. Then you can just do:

if (!rename("oldfilename.jpg", "/path/to/uploads/image451.jpg"))
{
  echo "oops, something went wrong moving your file.";
}

We don't know what server platform you're running so I can't be specific on how to check directory write permissions unless you add that info to your question.

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You should test if your destination is writeable before trying to move the new file there.

$dest_dir = "/path/to/uploads/";
$src_file = "path/to/orig/file.jpg";
if (is_writeable($dest_dir)) {
    $dest_file = $dest_dir . DIRECTORY_SEPARATOR . basename($src);
    if (false == rename($src, $dest_file)) {
        trigger_error('Could not move file', E_USER_ERROR);
    }
}
else {
    trigger_error('Destination dir is not writeable', E_USER_WARNING);
}