Question

I need a function which searches a dir for UP TO 5 files (only MAX 5 files in the dir). The files have the same names almost, an ID nr ending with '_1' for file 1, '_2' for file 2 etc. It simply ends with a underscore, and then the file-nr. Example:

   filename = id.'_1.jpg'; // File 1.

Here is the tricky part, read carefully: Now I need to search this dir and if there is (for example) a file1, and file3, BUT NO file2, then rename file3 to file2.

In other words, I need to find ‘gaps’ between the names and rename all files so they come in order, without ‘gaps’.

So another example, if dir contains 3 files ending with '_1.jpg' and '_3.jpg' and '_4.jpg' I want it to rename the files so that they are '_1.jpg' and '_2.jpg' and '_3.jpg', they come in order…

As I said there is max 5 files in this folder.

Please help me out… I am not that good in writing functions in PHP…
Thanks

PS: If I’m not clear, let me know and I will put in some more examples…

Answer 1

This is not necessarily the most elegant solution, but it might get you started.

function shuffleFiles($dirPath,$basename, $extension)
{
   $MAXFILES = 5;
   $originalFilenames = array();
   for($i = 1; $i <= $MAXFILES; $i++) // one-based
   {
     $name = $dirPath . '/' . $basename . '_' . $i . '.' . $extension;
     if(file_exists($name))
     {
        $originalFilenames[] = $name;
     }
   }
   $i = 0;
   foreach($originalFilenames as $oldname)
   {
      $i++;
      $newname = $dirPath . '/' . $basename . '_' . $i . '.' . $extension;
      rename($oldname, $newname);
   }     
}