php resizing image on upload rotates the image when i don't want it to

This is my code, resize image and don't rotates images with exif inside

PHP must be enabled: extension=php_mbstring.dll extension=php_exif.dll if error, See more: PHP：exif_read_data() not defined

function CreateThumbnail($pic,$thumb,$thumbwidth, $quality = 100)
{

        $im1=ImageCreateFromJPEG($pic);

        //if(function_exists("exif_read_data")){
                $exif = exif_read_data($pic);
                if(!empty($exif['Orientation'])) {
                switch($exif['Orientation']) {
                case 8:
                    $im1 = imagerotate($im1,90,0);
                    break;
                case 3:
                    $im1 = imagerotate($im1,180,0);
                    break;
                case 6:
                    $im1 = imagerotate($im1,-90,0);
                    break;
                } 
                }
        //}
        $info = @getimagesize($pic);

        $width = $info[0];

        $w2=ImageSx($im1);
        $h2=ImageSy($im1);
        $w1 = ($thumbwidth <= $info[0]) ? $thumbwidth : $info[0]  ;

        $h1=floor($h2*($w1/$w2));
        $im2=imagecreatetruecolor($w1,$h1);

        imagecopyresampled ($im2,$im1,0,0,0,0,$w1,$h1,$w2,$h2); 
        $path=addslashes($thumb);
        ImageJPEG($im2,$path,$quality);
        ImageDestroy($im1);
        ImageDestroy($im2);
}

The EXIF data is probably being ignored by this basic script.

Investigate whether your images have embedded rotation information using exif_read_data, and then auto-correct the rotation with a function like this.

In your case,

1. take the script I just linked,
2. paste it above the first line of your code,
3. change all the $image-> bits to $resizeObj->
   (vim-style grep: %s/image->/resizeObj->/g)