//参数:php imagick对象
public function autorotate(Imagick $image)
{
    switch ($image->getImageOrientation()) {
    case Imagick::ORIENTATION_TOPLEFT:
        break;
    case Imagick::ORIENTATION_TOPRIGHT:
        $image->flopImage();
        break;
    case Imagick::ORIENTATION_BOTTOMRIGHT:
        $image->rotateImage("#000", 180);
        break;
    case Imagick::ORIENTATION_BOTTOMLEFT:
        $image->flopImage();
        $image->rotateImage("#000", 180);
        break;
    case Imagick::ORIENTATION_LEFTTOP:
        $image->flopImage();
        $image->rotateImage("#000", -90);
        break;
    case Imagick::ORIENTATION_RIGHTTOP:
        $image->rotateImage("#000", 90);
        break;
    case Imagick::ORIENTATION_RIGHTBOTTOM:
        $image->flopImage();
        $image->rotateImage("#000", 90);
        break;
    case Imagick::ORIENTATION_LEFTBOTTOM:
        $image->rotateImage("#000", -90);
        break;
    default: // Invalid orientation
        break;
    }
    $image->setImageOrientation(Imagick::ORIENTATION_TOPLEFT);
    return $image;
}

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