Sorting Images based on Exif data

sort.php

<?php
 
$filetypes = array('jpg','jpeg','png','gif','bmp','tiff');
$source = './images_unsorted';
$target = './images_sorted';
 
$iterator = new RecursiveDirectoryIterator($source);
 
$bytestotal = 0;
$nbfiles = 0;
 
foreach (new RecursiveIteratorIterator($iterator) as $filename=>$fileobj) {
 
  $basename = $fileobj->getBasename();
  $extension = strtolower(substr($basename, strrpos($basename, '.')+1));
 
  if (in_array($extension, $filetypes)) {
 
    // read creation date from exif information, otherwise mtime
 
    echo $filename."\n";
    $exif = exif_read_data($filename, 'IFDO', 0);
    if ($exif!==false && isset($exif['DateTime'])) {
      $edate = $exif['DateTime'];
      $ts = strtotime($edate);
    } else {
      $ts = filemtime($filename);
    }
 
    // target folder
    $datestr = date('Y', $ts).'-'.date('m', $ts);
 
    $targetfolder = $target.'/'.$datestr;
    if (!file_exists($targetfolder)) {
      mkdir($targetfolder);
    }
 
    // copy file
    $targetfile = $targetfolder.'/'.$basename;
    if (!file_exists($targetfile)) {
      copy($filename, $targetfile);
    } else {
      echo "$targetfile exists!\n";
    }
 
  }
 
}
 
$bytestotal=number_format($bytestotal);
echo "Total: $nbfiles files, $bytestotal bytes\n";
 
?>