使用MPDF类库生成PDF文件

       require_once 'vendor/autoload.php';  //引入类库文件
       $config = [
            'mode' => 'utf-8',
            'format' => 'WEIXIN',
            'default_font_size' => 0,
            'default_font' => 'simhei',
            'mgl' => 52.5,
            'mgr' => 52.5,
            'mgt' => 64,
            'mgb' => 23,
            'mgh' => 38,
            'mgf' => 23,
            'orientation' => 'P'];
        $mpdf = new \Mpdf\Mpdf($config);
        //添加页眉和页脚到pdf中
        $mpdf->SetHTMLHeader($header);
        $mpdf->SetHTMLFooter($footer);
        $style = 
        // $t0    = microtime(1);
        $mpdf->WriteHTML($style, 1);
        $mpdf->WriteHTML($page1);
        $mpdf->AddPage();
        $mpdf->WriteHTML($page2 . $page3 . $page4);
        $fileName = $purchaseid . '.pdf';
        //输出pdf文件
        $mpdf->Output('pdf/' . $fileName, 'I'); //'I'表示在线展示 'D'则显示下载窗口 'F'保存本地文件