useds/app/common/utils/pdf/controller/PdfController.php

<?php
// app/controller/PdfController.php
namespace app\controller;

use support\Request;
use support\Response;
use support\View;
use app\common\utils\pdf\service\MpdfDriver;
use app\common\utils\pdf\service\PdfHelper;

class PdfController
{
    // ① 从“现有 HTML 文件 + 外链CSS”生成并在线预览
    public function previewFromFile(Request $request): Response
    {
        // 你的模板路径（示例）
        $tpl  = base_path('resource/templates/usedCar.html');
        // 可选：把 {{变量}} 替换
        $html = PdfHelper::loadTemplate($tpl, [
            'title' => '备货单',
            'order_no' => 'SO' . date('YmdHis'),
            'customer' => 'Magic Bridge Auto FZE',
        ]);

        $driver = new MpdfDriver();
        $pdf = $driver->htmlToPdf($html, [
            // 若 HTML 里用到相对资源（img/css），给个基准目录
            'asset_base' => public_path('assets/pdf'),
            // 也可以单独传 CSS 文件（推荐把 CSS 放在 public/assets/pdf）
            'css_files' => [
                public_path('assets/pdf/stock-order.css'),
            ],
            'header_html' => '<div style="text-align:right;color:#888;font-size:10px">Company • Stock Order</div>',
            'footer_html' => '<div style="text-align:center;color:#888;font-size:10px">{PAGENO} / {nbpg}</div>',
            'watermark_text' => '', // 'DRAFT'
        ]);

        return new Response(200, [
            'Content-Type' => 'application/pdf',
            'Content-Disposition' => 'inline; filename="stock-order.pdf"',
        ], $pdf);
    }

    // ② 直接下载
    public function download(Request $request): Response
    {
        $html = '<h1>发票</h1><p>客户：永生花</p>';
        $pdf = (new MpdfDriver())->htmlToPdf($html);
        return new Response(200, [
            'Content-Type' => 'application/pdf',
            'Content-Disposition' => 'attachment; filename="invoice.pdf"',
        ], $pdf);
    }

    // ③ 保存到本地（或上传 OSS 前先落盘）
    public function save(Request $request): Response
    {
        $tpl = base_path('resource/templates/invoice.html');
        $html = PdfHelper::loadTemplate($tpl, [
            'invoice_no' => 'INV' . date('YmdHis'),
            'amount' => '12345.67',
        ]);

        $pdf = (new MpdfDriver())->htmlToPdf($html, [
            'css_files' => [ public_path('assets/pdf/invoice.css') ],
            'asset_base'=> public_path('assets/pdf'),
        ]);

        $dir = runtime_path('pdf');
        if (!is_dir($dir)) mkdir($dir, 0777, true);
        $path = $dir . '/invoice-' . date('YmdHis') . '.pdf';
        file_put_contents($path, $pdf);

        return json(['path' => $path]);
    }
}