PHP function, a little help

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);
 } 
}

Answer 2

Works on any number of files per dir

function cleanUpMess($dir, $ext, $delimiter) {
 $files = glob($dir.'/*.'.$ext);
 $c = 1;
 foreach ($files as $file) {
 $secondPart = strrchr($file, $delimiter);
 $name = explode($secondPart, $file);
 $name = $name[0];
 $newFile = $name.$delimiter.$i.'.'.$ext;
 rename($file, $new);
 $c++;
 }
}