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I am uploading files to s3 bucket. Using exif_orientation to read exif data. It works fine for local image. But when we are uploading to Amazon s3, it is unable to read EXIF data. Reason I found is drupal_realpath function, that cant read from remote servers. What should be the alternative to this? How can we read EXIF data of a remote image then?

The other thin I am trying is reading EXIF from tmp image..

$source = $_FILES['files']['tmp_name']['field_image_und_9'];
$file_exif = exif_read_data($source);

But that shows this warning...

Warning: exif_read_data(): Unable to open file in _exif_orientation_rotate() (line 53 of /var/www/sitename.com/docroot/sites/all/modules/contrib/exif_orientation/exif_orientation.module).

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