Image is rotated 90 degree when displayed (image captured by a smartphone) - php

Question

Hi I am working on a php site where user can use PHP to upload an image and then the system will display the image , resized (to a smaller size). The resize codes are as follows:
<?php
ini_set('memory_limit', -1);
ini_set('max_execution_time', 40000);
require_once 'ThumbLib.inc.php';
$fileName = (isset($_GET['file'])) ? urldecode($_GET['file']) : null;
$thumb = PhpThumbFactory::create($fileName);
$thumb->Resize($_GET['width'], $_GET['height']);
$thumb->show();
?>
where the html codes are
<img src="show_image.php?width=230&height=1000000&file=appsub/<?php echo $v["xfile"]; ?>">
There is nothing wrong if the user uploads the image thru a PC, but when the user captures a photo using a smartphone (e.g. iPhone), sometimes the image displayed will be rotated by 90 degree .
How can I fix the problem ?

Answer 1

if you are not saving the rotated image, you may use the following to display it (after rotation)
<?php
// File and rotation
$filename = 'test.jpg';
$degrees = 180;
// Content type
header('Content-type: image/jpeg');
// Load
$source = imagecreatefromjpeg($filename);
// Rotate
$rotate = imagerotate($source, $degrees, );
// Output
imagejpeg($rotate);
// Free the memory
imagedestroy($source);
imagedestroy($rotate);
?>

Answer 2

The photo may have a "orientation" data so that you can rotate it back to normal if you want. You may use the following codes right after the user has uploaded the image:
Please note that your server must have Imagick installed. (most new servers have)
<?php
function autoRotateImage($image) {
$orientation = $image->getImageOrientation();
switch($orientation) {
case imagick::ORIENTATION_BOTTOMRIGHT:
$image->rotateimage("#000", 180); // rotate 180 degrees
break;
case imagick::ORIENTATION_RIGHTTOP:
$image->rotateimage("#000", 90); // rotate 90 degrees CW
break;
case imagick::ORIENTATION_LEFTBOTTOM:
$image->rotateimage("#000", -90); // rotate 90 degrees CCW
break;
}
// Now that it's auto-rotated, make sure the EXIF data is correct in case the EXIF gets saved with the image!
$image->setImageOrientation(imagick::ORIENTATION_TOPLEFT);
}
?>
<?php
$image = new Imagick('./sourcepath/'.$upload1);
autoRotateImage($image);
// - Do other stuff to the image here -
$image->writeImage('./destinationpath/'. $upload1);
?>