【发布时间】：2020-05-20 11:26:37
【问题描述】：
我正在尝试通过 DOMPDF 将 PHP 生成的表单的结果导出为 PDF。但它会生成一个空白页。可能是生成的 HTML 有一些问题。
PHP 脚本如下。我只是在这里粘贴 HTML 输出，因为 PHP 文件很长并且有很多功能。所以我猜这是 HTML 格式的问题：
<?php
require_once 'dompdf/autoload.inc.php';
use Dompdf\Dompdf;
?>
<!DOCTYPE html>
<head>
<title>Country Language</title>
</head>
<body>
<?php ob_start(); ?>
<form>
<table border="1"><tr><td><b>Countries Selected</b></td><td><b>Details</b></td><td><b>Amount</b></td></tr>
<tr>
<td rowspan='8'><h2>Australia</h2></td>
</tr>
<tr>
<td> Z</td>
<td>3</td>
</tr>
<tr>
<td> Entity</td>
<td> </td>
</tr>
<tr>
<td> N</td>
<td> 0</td>
</tr>
<tr>
<td>English to English</td>
<td> </td>
</tr>
<tr>
<td> X</td>
<td> 1</td>
</tr>
<tr>
<td> Y</td>
<td> 2</td>
</tr>
<tr>
<td><strong>TOTAL PATENT FEE</strong></td>
<td><b> USD 1400.45</b></td>
</tr>
<tr>
<td rowspan='8'><h2>India</h2></td>
</tr>
<tr>
<td> Z</td>
<td>3</td>
</tr>
<tr>
<td> Entity</td>
<td> Micro</td>
</tr>
<tr>
<td> N</td>
<td> 1</td>
</tr>
<tr>
<td>Arabic to English</td>
<td> </td>
</tr>
<tr>
<td> X</td>
<td> 1</td>
</tr>
<tr>
<td> Y</td>
<td> 2</td>
</tr>
<tr>
<td><strong>TOTAL PATENT FEE</strong></td>
<td><b> USD 315.45</b></td>
</tr>
</table>
<?php
if ( isset( $_GET['pdf'] ) ) {
$html = ob_get_contents();
$html = ob_get_clean();
$dompdf = new DOMPDF();
$dompdf->load_html($html);
$dompdf->setPaper('A4', 'portrait');
$dompdf->render();
$dompdf->stream("the_inquiry.pdf");
}
?>
<div class="shouldPrintToPDF">
<a href="/general/cean/cost-calc5.php?&pdf=1" class="pdflink">Open as PDF</a>
</div>
</form>
</body>
</html>
PHP 脚本如下：
<?php
require_once 'dompdf/autoload.inc.php';
use Dompdf\Dompdf;
if (isset($_GET['pdf'])) {
ob_start();
}
else {
?>
<!DOCTYPE html>
<head>
<title>Country Language</title>
</head>
<body>
<form>
<?php
if(isset($_POST['submit'])) {
$language_selected = $_POST['language'];
$claims_selected = $_POST['claims'];
$pages_selected = $_POST['pages'];
$totalwords_selected = $_POST['totalwords'];
$claims_selected = $_POST['claims'];
$entity_selected1 = $_POST['entity_selected'];
//echo '<div class="container">';
echo '<form>';
echo '<table border="1">';
echo '<tr><td><b>Countries Selected</b></td><td><b>Fee Details</b></td><td><b>Amount</b></td></tr>';
foreach ($_POST['check_list'] as $key => $country_checked) {
if(!empty($_POST['entity_selected'][$key])) {
$entity_selected = $_POST['entity_selected'][$key];
} else {
$entity_selected = '';
}
$sql_db = mysqli_query($conn,"SELECT id, country, language, entity FROM country_languages where country = '$country_checked' ");
//$row_db = mysqli_fetch_assoc($sql_db);
while($row_db = mysqli_fetch_array($sql_db)) {
$id = $row_db["id"];
$country = $row_db["country"];
$language = $row_db["language"];
$entity = $row_db["entity"];
if ($language_selected == $language) {
$Z = '0';
} else {
$Z = $totalwords_selected;
}
if ($entity_selected =='') {
$N = '0';
} else if ($entity_selected == 'Micro') {
$N = '1';
} else if (($entity_selected == 'Small') AND ($country_checked == 'India')) {
$N = '2.2';
} else if (($entity_selected == 'Small') AND ($country_checked !== 'India')) {
$N = '2';
} else if (($entity_selected == 'Large') AND ($country_checked == 'India')) {
$N = '4.4';
} else if (($entity_selected == 'Large') AND ($country_checked == 'Philippines')) {
$N = '5.5';
} else if (($entity_selected == 'Large') AND ($country_checked !== 'Philippines') AND ($country_checked !== 'India')) {
$N = '4';
} else {
$N = '0';
}
$X = $claims_selected;
$Y = $pages_selected;
if ($country_checked == 'USA') {
$result = (430 + 25 * ($X - 20) + 200 * (($Y - 100) / 50 + (1 - ($Y - 100) / 50))) * $N + 0.15 * $Z + 750;
} else {
$result = 'Not able to fetch data.';
}
?>
<tr>
<td rowspan='8'><h2><?php echo $country_checked; ?></h2></td>
</tr>
<tr>
<td> Z</td>
<td><?php echo $Z; ?></td>
</tr>
<tr>
<td> Entity</td>
<td> <?php echo $entity_selected; ?></td>
</tr>
<tr>
<td> N</td>
<td> <?php echo $N; ?></td>
</tr>
<tr>
<td><?php echo $language_selected; ?> to <?php echo $language; ?></td>
<td> </td>
</tr>
<tr>
<td> X</td>
<td> <?php echo $X; ?></td>
</tr>
<tr>
<td> Y</td>
<td> <?php echo $Y; ?></td>
</tr>
<tr>
<td><strong>TOTAL PATENT FEE</strong></td>
<td><b> USD <?php echo number_format((float)$result, 2, '.', ''); ?></b></td>
</tr>
<?php
} // END WHILE LOOP
} //END FOR LOOP
echo '</table>';
}
?>
<?php
if (isset($_GET['pdf'])) {
$html = ob_get_clean();
$dompdf = new DOMPDF();
$dompdf->load_html($html);
$dompdf->setPaper('A4', 'portrait');
$dompdf->render();
$dompdf->stream("the_inquiry.pdf");
}
else {
?>
<div class="shouldPrintToPDF">
<a href="<?php echo $_SERVER['PHP_SELF'] , '?' , http_build_query( $_GET ); ?>&pdf=1" class="pdflink">Open or save as PDF</a>
</div>
</form>
</body>
</html>
<?php } }?>
【问题讨论】：
-
虽然它与您的代码易受 SQL 注入攻击的问题没有密切联系！请查看 mysqli 准备好的语句并使用它们。您的代码也容易受到跨站脚本攻击，因为您不会转义从 URL 获得的数据（例如：
$_SERVER['PHP_SELF']）。 -
只有在发出 POST 请求并且数据可用于生成表时才会生成表。当您单击 PDF 链接时，会发出 GET 请求。您可以通过使用 GET 而不是 POST 发送和接收数据来解决它。 （例如：$_POST['language'] => $_GET['language']）。另一种解决方案是将 PDF 链接替换为发送必要数据的表单（它可以是带有隐藏输入字段的不可见表单）。
-
好的。你能给我一个用不可见表单替换 PDF 链接的样本吗
-
我用一个小例子更新了我的答案。希望对你有帮助！
-
生成字段或表单结果的循环太多了。无论如何感谢您的帮助。非常感谢您的时间。