This function does not honour EXIF orientation data.  Pictures that are rotated using EXIF, will show up in the original orientation after being handled by imagecreatefromjpeg().  Below is a function to create an image from JPEG while honouring EXIF orientation data.

<?php
    function imagecreatefromjpegexif($filename)
    {
        $img = imagecreatefromjpeg($filename);
        $exif = exif_read_data($filename);
        if ($img && $exif && isset($exif['Orientation']))
        {
            $ort = $exif['Orientation'];

            if ($ort == 6 || $ort == 5)
                $img = imagerotate($img, 270, null);
            if ($ort == 3 || $ort == 4)
                $img = imagerotate($img, 180, null);
            if ($ort == 8 || $ort == 7)
                $img = imagerotate($img, 90, null);

            if ($ort == 5 || $ort == 4 || $ort == 7)
                imageflip($img, IMG_FLIP_HORIZONTAL);
        }
        return $img;
    }
?>