if (isset($_POST['btn-save'])) {
    if (is_uploaded_file($_FILES['userImage']['tmp_name'])) {
        $filename = $_FILES['userImage']['tmp_name'];
        $filePath = $_FILES['userImage']['tmp_name'];
        $image1 = imagecreatefrompng($filePath);
        $image2 = imagecreatefromgif($filePath);
        $exif = exif_read_data($_FILES['userImage']['tmp_name']);
        if (!empty($exif['Orientation'])) {
            $imageResource = imagecreatefromjpeg($filePath);
            switch ($exif['Orientation']) {
                case 3:
                    $image = imagerotate($imageResource, 180, 0);
                    break;
                case 6:
                    $image = imagerotate($imageResource, -90, 0);
                    break;
                case 8:
                    $image = imagerotate($imageResource, 90, 0);
                    break;
                default:
                    $image = $imageResource;
            }
        }
        imagejpeg($image, $filename, 20);
        imagedestroy($imageResource);
        imagedestroy($image);
        imagejpeg($image1, $filename, 50);
        imagedestroy($image1);
        imagejpeg($image2, $filename, 50);
        imagedestroy($image2);
        $imgData = addslashes(file_get_contents($_FILES['userImage']['tmp_name']));
        $imageProperties = getimagesize($_FILES['userImage']['tmp_name']);
        $sql = "INSERT INTO Database (imageType, imageData) VALUES('{$imageProperties['mime']}', '{$imgData}')";
        $current_id = mysqli_query($conn, $sql) or die("<b>Error！</b> <br/>" . mysqli_error());
        if (isset($current_id)) {
            echo "post";
        } else {
            echo "fail";
        }
    }
} // post btn-save