exif data, php uploaded image rotation - php

Question

I'm having a hard time implemeting the php code will ensure that all uploaded photos will be oriented correctly upon upload.
here is my upload.php function ...
function process_image_upload($field)
{
if(!isset($_FILES[$field]['tmp_name']) || ! $_FILES[$field]['name'])
{
return 'empty';
}
$temp_image_path = $_FILES[$field]['tmp_name'];
$temp_image_name = $_FILES[$field]['name'];
list($iwidth, $iheight, $temp_image_type) =
getimagesize($temp_image_path);
if ($temp_image_type === NULL) {
return false;
}
elseif( $iwidth < 400 )
return 'size';
switch ($temp_image_type) {
case IMAGETYPE_GIF:
break;
case IMAGETYPE_JPEG:
break;
case IMAGETYPE_PNG:
break;
default:
return false;
}
$uploaded_image_path = UPLOADED_IMAGE_DESTINATION . $temp_image_name;
move_uploaded_file($temp_image_path, $uploaded_image_path);
$thumbnail_image_path = THUMBNAIL_IMAGE_DESTINATION .
preg_replace('{\\.[^\\.]+$}', '.jpg', $temp_image_name);
$main_image_path = MAIN_IMAGE_DESTINATION . preg_replace('{\\.[^\\.]+$}', '.jpg', $temp_image_name);
$result =
generate_image_thumbnail($uploaded_image_path,
$thumbnail_image_path,150,150
); if( $result )
$result =
generate_image_thumbnail($uploaded_image_path,$main_image_path,400,400,
true);
return $result ? array($uploaded_image_path, $thumbnail_image_path) :
false;
}
if(isset($_POST['upload'])):
$result = process_image_upload('image');
if ($result === false) {
update_option('meme_message','<div class="error" style="margin-
left:0;"><p>An error occurred while processing upload</p></div>');
} else if( $result === 'empty')
{
update_option('meme_message','<div class="error" style="margin-
left:0;"><p>Please select a Image file</p></div>');
}
elseif( $result === 'size')
{
update_option('meme_message','<div class="error" style="margin-
left:0;"><p>Image width must be greater than 400px;</p></div>');
}
else {
update_option('meme_message','<div style="margin-left:0;"
class="updated"><p>Image uploaded successfully</p></div>');
$guploaderr = false;
$count = intval(get_option('meme_image_count'));
update_option('meme_image_count', $count+1);
}
endif;
and here is some php that I know will work to rotate... but I don't know how to implement.
<?php
$image =
imagecreatefromstring(file_get_contents($_FILES['image_upload']
['tmp_name']));
$exif = exif_read_data($_FILES['image_upload']['tmp_name']);
if(!empty($exif['Orientation'])) {
switch($exif['Orientation']) {
case 8:
$image = imagerotate($image,90,0);
break;
case 3:
$image = imagerotate($image,180,0);
break;
case 6:
$image = imagerotate($image,-90,0);
break;
}
}
// $image now contains a resource with the image oriented correctly
?>