useds/app/common/utils/pdf/service/MpdfDriver.php

<?php
// app/service/pdf/MpdfDriver.php
namespace app\common\utils\pdf\service;

use Mpdf\Mpdf;
use Mpdf\Config\ConfigVariables;
use Mpdf\Config\FontVariables;
use Mpdf\HTMLParserMode;

class MpdfDriver
{

    public function htmlToPdf(string $html, array $options = []): string
    {
        $opts = array_merge([
            'format' => 'A4',
            'orientation' => 'L',
            'margin_top' => 12,
            'margin_bottom' => 12,
            'margin_left' => 10,
            'margin_right' => 10,
            'tempDir' => runtime_path('mpdf'),
            'header_html' => '',
            'footer_html' => '',
            'watermark_text' => '',
            'css_files' => [],
            'default_font' => 'notosanssc',
            'font_dirs' => [public_path('fonts')],
            'font_data' => [
                'notosanssc' => ['R' => 'NotoSansSC-Regular.ttf', 'B' => 'NotoSansSC-Bold.ttf'],
            ],
            'asset_base' => '',
            'enable_html5_parser' => true,
        ], $options);

        $defaultConfig = (new ConfigVariables())->getDefaults();
        $defaultFontConfig = (new FontVariables())->getDefaults();

        $fontDirs = array_merge($defaultConfig['fontDir'], $opts['font_dirs']);
        $fontData = array_merge($defaultFontConfig['fontdata'], $opts['font_data']);

        $mpdf = new Mpdf([
            'format' => $opts['format'],
            'orientation' => $opts['orientation'],
            'margin_left' => $opts['margin_left'],
            'margin_right' => $opts['margin_right'],
            'margin_top' => $opts['margin_top'],
            'margin_bottom' => $opts['margin_bottom'],
            'tempDir' => $opts['tempDir'],
            'fontDir' => $fontDirs,
            'fontdata' => $fontData,
            'default_font' => $opts['default_font'],
            'enable_html5_parser' => $opts['enable_html5_parser'],
        ]);

        if ($opts['header_html']) $mpdf->SetHTMLHeader($opts['header_html']);
        if ($opts['footer_html']) $mpdf->SetHTMLFooter($opts['footer_html']);

        if (!empty($opts['watermark_text'])) {
            $mpdf->SetWatermarkText($opts['watermark_text']);
            $mpdf->showWatermarkText = true;
            $mpdf->watermarkTextAlpha = 0.08;
        }

        // 资源绝对化（如果你有相对路径的图片等）
        $html = PdfHelper::absolutizeAssetUrls($html, $opts['asset_base']);

        // === 关键改动：把 <style>…</style> 抽出来，作为 HEADER_CSS 写入 ===
        [$inlineCss, $cleanHtml] = $this->extractCssAndCleanHtml($html);

        // 先写外部 css_files
        if (!empty($opts['css_files'])) {
            foreach ($opts['css_files'] as $cssFile) {
                if (is_file($cssFile)) {
                    $mpdf->WriteHTML(file_get_contents($cssFile), HTMLParserMode::HEADER_CSS);
                }
            }
        }
        // 再写内联 <style> 的 CSS
        if ($inlineCss !== '') {
            $mpdf->WriteHTML($inlineCss, HTMLParserMode::HEADER_CSS);
        }

        // 最后写 HTML 正文（已剔除 <style>，避免任何情况下把 CSS 当文字打印）
        $mpdf->WriteHTML($cleanHtml, HTMLParserMode::HTML_BODY);

        return $mpdf->Output('', \Mpdf\Output\Destination::STRING_RETURN);
    }

    /**
     * 把所有 <style>...</style> 的内容拼成一段 CSS，并把这些 <style> 标签从 HTML 中移除
     * @return array{0:string,1:string} [css, htmlWithoutStyle]
     */
    private function extractCssAndCleanHtml(string $html): array
    {
        $cssParts = [];
        // 抓取所有 <style ...>...</style>，DOTALL 支持跨行
        if (preg_match_all('/<style\b[^>]*>(.*?)<\/style>/is', $html, $m)) {
            foreach ($m[1] as $block) {
                // 去掉 HTML 注释，以防注释把 CSS 包起来
                $block = preg_replace('/<!--|-->/', '', $block);
                $cssParts[] = trim($block);
            }
            // 从 HTML 删除所有 <style> 块
            $html = preg_replace('/<style\b[^>]*>.*?<\/style>/is', '', $html);
        }
        $css = implode("\n\n", $cssParts);

        // 额外保险：把 <head> 也清理掉，防止某些解析器把 head 里残余文本当正文
        $html = preg_replace('/<head\b[^>]*>.*?<\/head>/is', '', $html);

        // 确保剩余 HTML 有 <body>，没有就包一层
        if (!preg_match('/<body\b/i', $html)) {
            $html = '<body>' . $html . '</body>';
        }
        return [$css, $html];
    }

    public function exportUsedCarPdf($car)
    {
        /*$car = [
            'title' => '奥迪Q3 2013款 35 TFSI 舒适型',
            'vin' => '',
            'price' => 450000,
            'source_city' => '北京',
            'register_city' => '随州',
            'register_date' => '2026-01-05',
            'displacement' => '2.1T',
            'mileage' => 45000,
            'power' => 350,
            'color' => '',
            'created_at' => '2026-01-05 17:23:34',
            'images' => [
                'https://xxx.com/1.jpg',
                'https://xxx.com/2.jpg',
                'https://xxx.com/3.jpg',
            ],
            'description' => '该车内饰干净整洁，车况精品...'
        ];*/

        ob_start();
        //include app_path() . '/view/pdf/car_detail_pdf.php';
        $tpl = base_path('app/common/utils/pdf/template/usedCar.stub');
        include $tpl;
        $html = ob_get_clean();

        $mpdf = new Mpdf([
            'mode' => 'utf-8',
            'format' => 'A4',
            'margin_top' => 10,
            'margin_bottom' => 10,
            'margin_left' => 10,
            'margin_right' => 10,
            'default_font' => 'sun-exta'
        ]);

        $mpdf->WriteHTML($html);

        foreach ($car['attachment'] as $attachment) {
            $this->appendPdf($mpdf,$attachment);
        }

        $pdf = $mpdf->Output('车辆详情.pdf', 'S');
        $dir = runtime_path('pdf');
        if (!is_dir($dir)) mkdir($dir, 0777, true);
        $pdfName = 'invoice-' . date('YmdHis').'-'.$car['id'] . '.pdf';
        $path = $dir . '/' . $pdfName;
        file_put_contents($path, $pdf);

        return $pdfName;
    }

    public function appendPdf(Mpdf $mpdf, string $pdfPath)
    {
        $pageCount = $mpdf->SetSourceFile($pdfPath);
        for ($i = 1; $i <= $pageCount; $i++) {
            $tplId = $mpdf->ImportPage($i);
            $size = $mpdf->getTemplateSize($tplId);

            $mpdf->AddPageByArray([
                'orientation' => $size['orientation'],
                'sheet-size' => [$size['width'], $size['height']]
            ]);

            $mpdf->UseTemplate($tplId);
        }
    }

}