将动态 php 页面的内容与 css 保存为 pdf 在服务器上

我有一个PHP页面，它从数据库中检索页面本身中显示的各种数据。我想生成包含内容的PDF文件，并将该文件保存在服务器中以供以后使用。我的PHP页面在浏览器中完美呈现。
我尝试使用header('Content-disposition: attachment; filename=filename.pdf');，但出现错误Failed to load PDF document.我也
尝试了dompdf但最终得到空白的pdf文档。
由于该文件包含一些敏感数据，因此我不会冒险将内容发送到第三方服务器。请帮帮我。

我的文件主要包含PHP和CSS。

<?php
include('php-include/connect.php');
if(isset($_GET['purpose']) && isset($_GET['membership'])) {
$purpose = $_GET['purpose'];
$membership = $_GET['membership'];
if ($purpose == 'Volunteer Membership') {
$member_type = 'temporary';
$query = mysqli_query($con,"select * from temp_members where `membership`='$membership'");
if (mysqli_num_rows($query) > 0) {
while ($row = mysqli_fetch_array($query)) {
$name = $row['name'];
$email = $row['email'];
$address = $row['address'];
$city = $row['place'];
$state = $row['state'];
$country = $row['country'];
$pin = $row['pin'];
$bloodgroup = $row['bloodgroup'];
$dob = $row['dob'];
}
}
} 
}
$count = substr($membership,-10);
$myDateTime = DateTime::createFromFormat('Y-m-d', $dob);
$dob = $myDateTime->format('d/m/Y');
$today = date('d/m/Y');
switch ($member_type) {
case 'temporary':
$validity = strtotime("+6 months");
$validity = date('d/m/Y', $validity);
break;
case 'default':
$validity = 'Lifetime';
}
?>
<?php // HTTP Headers for PDF File Downloads
// set example variables
$filename = $membership.".pdf";
$filepath = "http://localhost/example/Members/";
// http headers for zip downloads
header("Pragma: public");
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Cache-Control: public");
header("Content-Description: File Transfer");
header("Content-type: application/octet-stream");
header("Content-Disposition: attachment; filename="".$filename.""");
header("Content-Transfer-Encoding: binary");
header("Content-Length: ".filesize($filepath.$filename));
ob_end_flush();
@readfile($filepath.$filename);
?>
<?php
require_once('dompdf/autoload.inc.php');
use DompdfDompdf;
$dompdf = new Dompdf();
//$dompdf->set_paper('A4','landscape');
$fileurl = 'http://localhost/example/card view.php?purpose='.$purpose.'&membership='.$membership;
$dompdf->loadHtmlFile($fileurl);
$dompdf->render();
//$dompdf->stream();
$output = $dompdf->output();
$file = "http://localhost/example/Members/".$membership.".pdf";
file_put_contents($file, $output);
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head profile="http://www.w3.org/2005/10/profile">
<link href="images/logo.png" rel="shortcut icon" type="image/png" />
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.0.8/css/all.css">
<style type="text/css" media="all">
@font-face {
font-family: "CHECKBK0";
src: url(http://localhost/example/fonts/CHECKBK0.TTF) format('truetype');
}
@font-face {
font-family: "miner";
src: url(http://localhost/example/fonts/MANICMINER.ttf) format('truetype');
}
#top {
height: 100%;
}
#position_me {
left: 0;
}
#printerhide {
left: 50px;
top: 450px;
position: fixed;
text-align: center;
}
#printarea {
border: medium solid #8B7B67;
width: 360px;
height: 270px;
border-radius: 5%;
}
.Seal{
height: 60px;
width: 350px;
position: fixed;
left: 15px;
top: 27px;
background-image: url(http://localhost/example/images/logo1.png);
background-color: #DDDDDD;
background-size: 350px 60px;
background-repeat: no-repeat;
z-index: 5;
filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='http://localhost/example/images/logo1.png',sizingMethod='scale');
-ms-filter: "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='http://localhost/example/images/logo1.png',sizingMethod='scale')";
}
.Signature{
width: 100px;
height: 50px;
position: fixed;
left: 205px;
top: 184px;
background-image: url(http://localhost/example/images/signature.png);
background-size: 100px 50px;
background-repeat: no-repeat;
z-index: 11;
filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='http://localhost/example/images/signature.png',sizingMethod='scale');
-ms-filter: "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='http://localhost/example/images/signature.png',sizingMethod='scale')";
}
.ExaminerText{
width: fit-content;
position: fixed;
left: 230px;
top: 217px;
color: #8B7B67;
z-index: 11;
}
.ParagraphSmall{
height: 200px;
width: fit-content;
position: fixed;
font-size: 13px;
text-align: left;
z-index: 11;
color: #8B7B67;
max-width: 300px;
}
.ParagraphMedium{
width: 350px;
position: fixed;
left: 15px;
top: 242px;
font-size: 12px;
text-align: center;
z-index: 11;
color: #8B7B67;
}
.MembershipNumber {
height: 15px;
width: 350px;
position: fixed;
font-size: 14px;
z-index: 11;
color: #8B7B67;
}
.Number {
font-family: "miner";
font-size: 12px;
}
.MiddleLine{
width: 350px;
position: fixed;
left: 15px;
top: 232px;
z-index: 11;
color: #8B7B67;
}
.StudentName{
font-weight: bold;
font-size: 15px;
text-align: center;
z-index: 11;
color: #8B7B67;
}
</style>
</head>
<body><div id="printarea">
<div class="StudentName" style="width: 350px; margin-left: -3px; margin-top: -2px;"><?php echo($purpose) ?></div>
<div class="MembershipNumber" style="left: 135px; top: 89px; width: 230px">Membership #: <span class="Number">EX</span><span style="font-family: 'CHECKBK0'"><?php echo($count) ?></span></div>
<div class="MembershipNumber" style="left: 15px; top: 102px">Name: <span class="StudentName"><?php echo($name) ?></span></div>
<div class="MembershipNumber" style="left: 15px; top: 117px">Address:&nbsp;<span class="ParagraphSmall" style="top: 117px"><?php echo("$address, $city, $state, $country. PIN - $pin") ?></span></div>
<div class="MembershipNumber" style="left: 15px; top: 182px">DOB:&nbsp;<span class="ParagraphSmall"><?php echo($dob) ?></span></div>
<div class="MembershipNumber" style="left: 15px; top: 202px">BloodGroup:&nbsp;<span class="ParagraphSmall"><?php echo($bloodgroup) ?></span></div>
<div class="MembershipNumber" style="left: 15px; top: 222px">Valid upto:&nbsp;<span class="ParagraphSmall"><?php echo($validity) ?></span></div>
<div class="Seal"></div>
<hr class="MiddleLine" />
<div class="ExaminerText">Secretary</div>
<div class="Signature"></div></div>
</body>
</html>

我在这里提到了对应于上述两种方法的两个代码。请查看代码并指导我获得所需的输出。
提前谢谢。

仅仅添加说明您要返回的内容是PDF类型的标题是不够的，因为您要发送的内容不是该格式。我可以告诉你，我有使用 fpdf (http://www.fpdf.org/( 在 PHP 中创建 PDF 文档的经验，而且效果很好。您可以使用 FPDF 库创建文档，然后返回文件内容而不是当前返回的 HTML。

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