| drupal_set_message | includes/bootstrap.inc | Set a message which reflects the status of the performed operation. |
| image_get_info | includes/image.inc | Get details about an image. |
| image_scale | includes/image.inc | Scales an image to the given width and height while maintaining aspect
ratio. |
| t | includes/common.inc | Translate strings to the current locale. |
| variable_get | includes/bootstrap.inc | Return a persistent variable. |
| _upload_image | modules/upload/upload.module | Check an upload, if it is an image, make sure it fits within the
maximum dimensions allowed. |
