在GIF图片上打水印，图片合成

endroid/qrcode //如果需要一个二维码的话
sybio/image-workshop
sybio/gif-creator
sybio/gif-frame-extractor

<?php
/**
* 给Gif图片打水印Demo
*/
require_once __DIR__ . '/vendor/autoload.php';

use Endroid\QrCode\QrCode;
use PHPImageWorkshop\ImageWorkshop;
use GifFrameExtractor\GifFrameExtractor;
use GifCreator\GifCreator;

$background = 'images/宝钗_hd.gif';
$tea_image = 'images/drink.png';

$text = 'PHP是最好的编程语言，没有之一'; //二维码上自然要这么写
$qrCode = new QrCode($text); //创建一个二维码对象
$qrCode->setSize(100); //设置大小，单位像素
$qr_resource = imagecreatefromstring($qrCode->writeString()); //生成一个二维码图片资源
$qr_image = ImageWorkshop::initFromResourceVar($qr_resource); //设置一个二维码图层

$image_info = getimagesize($background); //图片的长宽参数
$tea = ImageWorkshop::initFromPath($tea_image); //喝茶图层
//$tea = ImageWorkshop::initTextLayer('呵呵', 'simkai.ttf', 15); //假如希望在图片上写一行文字

if (GifFrameExtractor::isAnimatedGif($background)) { //底图如果是gif
$extractor = new GifFrameExtractor();
$frames = $extractor->extract($background, false); //gif图拆成帧，第二个参数只有对原图有万分保证，质量极佳的情况下才应该设置为true

foreach ($frames as $frame) { //逐帧处理

$frame_layer = ImageWorkshop::initFromResourceVar($frame['image']); //帧图层
$frame_layer->resizeInPixel($image_info[0], $image_info[1], true); // 设置每一帧的高度宽度

$frame_layer->addLayerOnTop($tea, 0, 0, 'LB'); // 添加喝茶图层，位置距离左下角坐标为 0,0
$frame_layer->addLayerOnTop($qr_image, 0, 0, 'RB'); //在背景图层上叠加自定义二维码，距离右下角坐标为 0,0

$new_frames[] = $frame_layer->getResult(); //逐帧入栈

}

$creator = new GifCreator();
$creator->create($new_frames, $extractor->getFrameDurations(), 0); //我们需要一直循环
$new_gif = $creator->getGif(); //将新的帧序列创建为新的GIF图片
$file_name = '请宝姐姐喝茶_'. time() . '.gif';
file_put_contents('images/target/' . $file_name, $new_gif); //简单粗暴的将图片字节写入文件

}