Fixing photo orientation on images uploaded via PHP

Below is a great function (created by Wes over on Stack Overflow) that can be used to automatically correct the image orientation when uploading images (the main culprit for weird orientation related glitches being iOS based devices) – simple call the correctImageOrientation() function after uploading the image and voilla the rotation/orientation of the image is corrected!

The function:

function correctImageOrientation($filename) {
  if (function_exists('exif_read_data')) {
    $exif = exif_read_data($filename);
    if($exif && isset($exif['Orientation'])) {
      $orientation = $exif['Orientation'];
      if($orientation != 1){
        $img = imagecreatefromjpeg($filename);
        $deg = 0;
        switch ($orientation) {
          case 3:
            $deg = 180;
            break;
          case 6:
            $deg = 270;
            break;
          case 8:
            $deg = 90;
            break;
        }
        if ($deg) {
          $img = imagerotate($img, $deg, 0);       
        }
        // then rewrite the rotated image back to the disk as $filename
        imagejpeg($img, $filename, 95);
      } // if there is some rotation necessary
    } // if have the exif orientation info
  } // if function exists     
}

Calling the function:

move_uploaded_file($uploadedFile, $destinationFilename);
correctImageOrientation($destinationFilename);