PHP read_exif_data and Adjust Orientation

Based on Daniel's code I wrote a function that simply rotates an image if necessary, without resampling.

GD

function image_fix_orientation(&$image, $filename) {
    $exif = exif_read_data($filename);
    
    if (!empty($exif['Orientation'])) {
        switch ($exif['Orientation']) {
            case 3:
                $image = imagerotate($image, 180, 0);
                break;
            
            case 6:
                $image = imagerotate($image, 90, 0);
                break;
            
            case 8:
                $image = imagerotate($image, -90, 0);
                break;
        }
    }
}

One line version (GD)

function image_fix_orientation(&$image, $filename) {
    $image = imagerotate($image, array_values([0, 0, 0, 180, 0, 0, -90, 0, 90])[@exif_read_data($filename)['Orientation'] ?: 0], 0);
}

ImageMagick

function image_fix_orientation($image) {
    if (method_exists($image, 'getImageProperty')) {
        $orientation = $image->getImageProperty('exif:Orientation');
    } else {
        $filename = $image->getImageFilename();
        
        if (empty($filename)) {
            $filename = 'data://image/jpeg;base64,' . base64_encode($image->getImageBlob());
        }
        
        $exif = exif_read_data($filename);
        $orientation = isset($exif['Orientation']) ? $exif['Orientation'] : null;
    }
    
    if (!empty($orientation)) {
        switch ($orientation) {
            case 3:
                $image->rotateImage('#000000', 180);
                break;
            
            case 6:
                $image->rotateImage('#000000', 90);
                break;
            
            case 8:
                $image->rotateImage('#000000', -90);
                break;
        }
    }
}

The documentation for imagerotate refers to a different type for the first parameter than you use:

An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().

Here is a small example for using this function:

function resample($jpgFile, $thumbFile, $width, $orientation) {
    // Get new dimensions
    list($width_orig, $height_orig) = getimagesize($jpgFile);
    $height = (int) (($width / $width_orig) * $height_orig);
    // Resample
    $image_p = imagecreatetruecolor($width, $height);
    $image   = imagecreatefromjpeg($jpgFile);
    imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);
    // Fix Orientation
    switch($orientation) {
        case 3:
            $image_p = imagerotate($image_p, 180, 0);
            break;
        case 6:
            $image_p = imagerotate($image_p, 90, 0);
            break;
        case 8:
            $image_p = imagerotate($image_p, -90, 0);
            break;
    }
    // Output
    imagejpeg($image_p, $thumbFile, 90);
}

Simpler function for those uploading an image, it just autorotates if necessary.

function image_fix_orientation($filename) {
    $exif = exif_read_data($filename);
    if (!empty($exif['Orientation'])) {
        $image = imagecreatefromjpeg($filename);
        switch ($exif['Orientation']) {
            case 3:
                $image = imagerotate($image, 180, 0);
                break;

            case 6:
                $image = imagerotate($image, 90, 0);
                break;

            case 8:
                $image = imagerotate($image, -90, 0);
                break;
        }

        imagejpeg($image, $filename, 90);
    }
}

Why is nobody considering mirrored cases 2,4,5,7? There are 4 more cases in exif orientation land:

Here is a complete solution taking a filename:

function __image_orientate($source, $quality = 90, $destination = null)
{
    if ($destination === null) {
        $destination = $source;
    }
    $info = getimagesize($source);
    if ($info['mime'] === 'image/jpeg') {
        $exif = exif_read_data($source);
        if (!empty($exif['Orientation']) && in_array($exif['Orientation'], [2, 3, 4, 5, 6, 7, 8])) {
            $image = imagecreatefromjpeg($source);
            if (in_array($exif['Orientation'], [3, 4])) {
                $image = imagerotate($image, 180, 0);
            }
            if (in_array($exif['Orientation'], [5, 6])) {
                $image = imagerotate($image, -90, 0);
            }
            if (in_array($exif['Orientation'], [7, 8])) {
                $image = imagerotate($image, 90, 0);
            }
            if (in_array($exif['Orientation'], [2, 5, 7, 4])) {
                imageflip($image, IMG_FLIP_HORIZONTAL);
            }
            imagejpeg($image, $destination, $quality);
        }
    }
    return true;
}