note 102719 deleted from function.touch by danbrown

Note Submitter: Vital 

----

<?
// Touch file $image_file and set creation date based on date from EXIF
//
// @return Integer
//   NULL   - if no EXIF data
//   1      - creation date changed
//   2      - no change needed (same dates)
//   0      - colud not touch

function touch_exif($image_file)
{
  $info=exif_read_data($image_file);
  if (!$info) return NULL;

  $datetime=isset($info['DateTime'])?
                  $info['DateTime']:
                  (isset($info['DateTimeOriginal'])?
                         $info['DateTimeOriginal']:
                         (isset($info['DateTimeDigitized'])?
                                $info['DateTimeDigitized']:
                                false));

  $filetime=isset($info['FileDateTime'])?
                  $info['FileDateTime']:
                  false;

  if(!$datetime) return NULL;

  //0 yyyy:mm:dd, 1 hh:mm:ss
  $datetime=explode(' ',$datetime);

  list($y,$m,$d)=explode(':', $datetime[0]);
  list($hh,$mm,$ss)=explode(':', $datetime[1]);

  $datetime=mktime($hh, $mm, $ss, $m, $d, $y, 0);

  if ($datetime==$filetime) return 2;

  return (int)touch($argv[1], $datetime);
}
?>

Example of usage. Command line creation date changer.
<?
if($argc<2) die('Usage: php '.$argv[0].' image_name.jpg');

switch (touch_exif($argv[1]))
{
  case NULL:die('EXIF date not found');
  case 0:die('Fail. Do i have access?');
  case 1:die('Success');
  case 2:die('No change needed');
}
?>