Sequentially Rename All Image Files In A Directory With PHP

The following function will rename all of the image files in a directory to be sequential. The parameters are the path of the directory that the files are in and the name of a function that will be used to sort the array of files through the PHP usort() function.

function sequentialImages($path, $sort=false) {


 $i = 1;


 $files = glob($path."/{*.gif,*.jpg,*.jpeg,*.png}",GLOB_BRACE|GLOB_NOSORT);


 


 if ( $sort !== false ) {


  usort($files, $sort);


 }


 


 $count = count($files);


 foreach ( $files as $file ) {


  $newname = str_pad($i, strlen($count)+1, '0', STR_PAD_LEFT);


  $ext = substr(strrchr($file, '.'), 1);


  $newname = $path.'/'.$newname.'.'.$ext;


  if ( $file != $newname ) {


   rename($file, $newname);  


  }


  $i++;


 }


}

The following function can be used in the second parameter to sort the files by their last modified time.

function sort_by_mtime($file1, $file2) {


 $time1 = filemtime($file1);


 $time2 = filemtime($file2);


 if ( $time1 == $time2 ) {


  return 0;


 }


 return ($time1 < $time2) ? 1 : -1;


}

Putting these two function together we can call the sequentialImages() function like this.

sequentialImages('files','sort_by_mtime');

This function takes the following set of images:

file1.gif


file2.gif


wibble.gif


wobble.gif


02.gif

And renames them to the following:

01.gif


02.gif


03.gif


04.gif


05.gif