<?php

namespace app\common\server;

use Endroid\QrCode\QrCode;
use Endroid\QrCode\Writer\PngWriter;
class autoload
{
    public function generatePosterWithQR($backgroundUrl, $qrText)
    {

        // 加载背景图
        $backgroundImage = imagecreatefromjpeg($backgroundUrl);
        if (!$backgroundImage) {
            return;
        }

        $backgroundWidth = imagesx($backgroundImage);
        $backgroundHeight = imagesy($backgroundImage);

        // 生成二维码
        $qrSize = 850;
        $qrCode = new QrCode($qrText);
        $qrCode->setSize($qrSize);
        $writer = new PngWriter();
        $qrImage = $writer->write($qrCode);

        // 将二维码转换为 GD 图像资源
        $qrImageResource = imagecreatefromstring($qrImage->getString());

        // 计算二维码的放置位置
        $qrX = ($backgroundWidth - $qrSize) / 2;
        $qrY = ($backgroundHeight - $qrSize) * 0.78;

        // 将二维码绘制到背景图上
        imagecopy($backgroundImage, $qrImageResource, $qrX, $qrY, 0, 0, $qrSize, $qrSize);

        // 创建一个临时的内存文件，保存合成后的图片
        ob_start();
        imagepng($backgroundImage); // 输出图像为PNG格式
        $imageData = ob_get_contents();
        ob_end_clean();

        // 释放图像资源
        imagedestroy($backgroundImage);
        imagedestroy($qrImageResource);

        // 返回合成后的图片的字节数据
        return $imageData;

    }

}