Реализация метода экспорта PDF-файлов с помощью PDF в PHP

/**
 * PHP uses MPDF to export PDF files
 *@ If the content of the param $content string PDF file is HTML code and the CSS content is separated from non-id, the class selector may fail. The solution is written directly into the label style.
 *@ Param $filename string saves the file name
 *@ Param $css string CSS style content
 */
function export_pdf_by_mpdf($content, $filename, $css = '')
{
 set_time_limit(0);
 include_once './mpdf/mpdf.php';
 // instantiate MPDF
 $_obj_mpdf = new mPDF ('utf-8','A4',','Songti', 0, 0, 20, 10);
 // Setting PDF header content (custom editing style)
 $header = '
    < tr > < TD width = "10%"> < / td > < TD width = "80%" align = "center" style = "font-size: 16px; color: A0A0"> header < / td > < TD width = "10%" style = "text-align: right;" > < / td > < / TR > < / table >;
 // Set up PDF footer content (custom editing style)
 $footer = '
    < TD width = "10%">  < TD width = "80%" align = "center" style = "font-size: 14px; color: A0A0"> footer  < TD width = "10%" style = "text-align: left;"
    Page number: {PAGENO}/{nb}';
 // Add header and footer to PDF
 $_obj_mpdf->SetHTMLHeader($header);
 $_obj_mpdf->SetHTMLFooter($footer);
 $_obj_mpdf-> SetDisplayMode ('fullpage'); //Set PDF display mode
 $_obj_mpdf-> WriteHTML (''); and // Set the size of PDF A4 paper: 210mm*297mm
 Empty ($css) & & $_obj_mpdf - > WriteHTML ($css, 1); //Set PDF CSS Style
 $_obj_mpdf - > WriteHTML ($content); // Write $content to PDF
 $_obj_mpdf-> Delete Pages (1, 1); //Delete the first page of PDF (one more page due to setting PDF size)
 // Output PDF to download PDF files directly
 //$_obj_mpdf->Output($filename . '.pdf', true);
 //$_obj_mpdf->Output($filename . '.pdf', 'D');
 $_obj_mpdf-> Output ();//Output PDF browser preview file can be saved by right-clicking
 exit;
}
$html ='< B style ='color: red'> see where I look like a good man ';
$wordname = 'test-file';
export_pdf_by_mpdf($html, $wordname);