The library automatically rotates the provided image based on the embedded EXIF data. I use it in my projects to correctly display images uploaded from mobile devices.
<?php if (!defined('BASEPATH')) exit('No direct script access allowed');
/**
* @file application/libraries/Image_autorotate.php
*/
class Image_autorotate
{
function __construct($params = NULL) {
if (!is_array($params) || empty($params)) return FALSE;
$filepath = $params['filepath'];
$exif = @exif_read_data($filepath);
if (empty($exif['Orientation'])) return FALSE;
$CI =& get_instance();
$CI->load->library('image_lib');
$config['image_library'] = 'gd2';
$config['source_image'] = $filepath;
$oris = array();
switch($exif['Orientation'])
{
case 1: // no need to perform any changes
break;
case 2: // horizontal flip
$oris[] = 'hor';
break;
case 3: // 180 rotate left
$oris[] = '180';
break;
case 4: // vertical flip
$oris[] = 'ver';
break;
case 5: // vertical flip + 90 rotate right
$oris[] = 'ver';
$oris[] = '270';
break;
case 6: // 90 rotate right
$oris[] = '270';
break;
case 7: // horizontal flip + 90 rotate right
$oris[] = 'hor';
$oris[] = '270';
break;
case 8: // 90 rotate left
$oris[] = '90';
break;
default: break;
}
foreach ($oris as $ori) {
$config['rotation_angle'] = $ori;
$CI->image_lib->initialize($config);
$CI->image_lib->rotate();
}
}
}
// END class Image_autorotate
/* End of file Image_autorotate.php */
/* Location: ./application/libraries/Image_autorotate.php */
Usage example:
$imageinfo = $this->upload->data();
$full_path = $imageinfo['full_path'];
// check EXIF and autorotate if needed
$this->load->library('image_autorotate', array('filepath' => $full_path));
Inspired by this post on PHP.net (thanks to the author).