【发布时间】：2020-04-23 16:59:39
【问题描述】：
我正在 Laravel 中做一个项目，其中学生的证书将使用 Barryvdh DomPDF 动态生成。这是我的控制器功能：
public function certPdfGenerate()
{
ini_set('memory_limit', '-1');
$apply_id= input::get('id');
$get_certificate_data = DB::Connection('mysql1')->table('tbl_apply_certificate')->where('apply_id',$apply_id)->first();
$get_certificate_id1 = DB::Connection('mysql1')->table('tbl_apply_certificate')->select('apply_certificate_id')->where('apply_id',$apply_id)->get()->toArray();
foreach ($get_certificate_id1 as $key)
{
$get_certificate_id = $key->apply_certificate_id;
}
$filename = $get_certificate_id.'.pdf';
DB::Connection('mysql1')->table('tbl_apply_certificate')
->where('apply_id', $apply_id)
->update(['apply_pdf' => $filename]);
$data1 = [$get_certificate_data];
$pdf=PDF::loadView('students::htmlcertificate', array('data' =>$data1), [], ['format' => 'A4-L']);
$pdf->setPaper('A4', 'landscape');
$pdf->save(storage_path('certificates/'.$get_certificate_id.'.pdf'));
return $pdf->stream('htmlcertificate.pdf');
}这是我的浏览页面：
<style type="text/css">
#certbackground
{
background-image: url('http://localhost/folder_name/public/cer_template/final-certificate.png');
background-position: top left;
background-repeat: no-repeat;
background-size: 100%;
padding: 300px 100px 10px 100px;
width:100%;
height:100%;
}
#certbackground1
{
background-image: url('http://localhost/folder_name/public/cer_template/final-certificate-back.png');
background-position: top left;
background-repeat: no-repeat;
background-size: 100%;
padding: 300px 100px 10px 100px;
width:100%;
height:100%;
}
</style>
</head>
<body>
<div id="certbackground">
@foreach ($data as $value)
<h3 style="margin-top: 142px;margin-left: 900px;font-weight: 100;">{{$value->apply_certificate_id}}</h3>
<h3 style="margin-top: 30px;margin-left: 370px;font-weight: 100;">{{$value->apply_name}}</h3>
<img style="height: 180px!important;margin-top: -5px;margin-left: 845px;" src="{{ URL::asset('public/certif_pro_image/'.$value->apply_photo) }}" />
<h3 style="margin-top: -148px;margin-left: 370px;font-weight: 100;">{{$value->apply_course}}</h3>
<h3 style="position:absolute;top:320px!important;margin-top:320px;margin-left: 450px;font-weight: 100;">{{$value->apply_softwares}}</h3>
<h3 style="position:absolute;top:175px!important;margin-top:175px;margin-left: 532px;font-weight: 100;">{{date('d-m-Y', strtotime($value->apply_start_date))}}</h3>
<h3 style="position:absolute;top:175px!important;margin-top:175px;margin-left: 670px;font-weight: 100;">{{date('d-m-Y', strtotime($value->apply_end_date))}}</h3>
<h3 style="position:absolute;top:189px!important;margin-top:189px;margin-left: 550px;font-weight: 100;">Grade {{$value->apply_grade}}</h3>
<h3 style="position:absolute;top:210px!important;margin-top:210px;margin-left: 440px;font-weight: 100;">{{$value->apply_centre}}</h3>
<img style="height: 80px!important;position:absolute;top:196px;margin-top:196px;margin-left: 220px;" src="{{ URL::asset('public/qrcode/'.$value->apply_qrcode) }}" />
<h5 style="position:absolute;top:545px;margin-left: 5px;font-weight: 100;">www.domain.in/certificate/{{$value->apply_certificate_id}}</h5>
@endforeach
</div>
<div style="page-break-after: always;"></div>
<div id="certbackground1">
</div>
</body>这里的问题是pdf的背景图片在pdf中太大了。背景图片大小为 3507 x 2480，分辨率为 300。当我将图片大小更改为 1058 x 748 时，它适合 pdf，但打印后的 pdf 质量太低。
我们如何调整pdf的背景图片又不失清晰度？
【问题讨论】：
标签： php html css laravel dompdf