Question

我有一个查询数据库的php文件，然后相应地写入和更新html。

我在此页面上有一个按钮“导出为PDF”..我正在尝试使用HTML2FPDF将此页面转换为pdf，但是我收到以下错误：

FPDF error: Unable to create output file: Entry Report

我怀疑问题是因为我传递的是php文件而不是html文件：

<?php
require('html2fpdf.php');

if(isset($_POST['link'])){
  $url = $_POST['link'];
  $nm = $_POST['nm'];
  convert($url, $nm);
}

function convert($link, $name){
  $pdf=new HTML2FPDF();
  $pdf->AddPage();
  $fp = fopen($link,"r");
  $strContent = fread($fp, filesize($link));
  fclose($fp);
  $pdf->WriteHTML($strContent);
  $pdf->Output($name);
  echo ("PDF file generated successfully!");
}
?>

有谁知道我怎么能解决这个问题？也许通过将php转换为html然后将html转换为pdf ...

或者是否有直接的方法将php文件转换为pdf文件...

编辑：好的，问题是我不允许公共写权限。更改此内容后，我设法创建了pdf文件......问题是这个.... pdf文件是空白的......

我知道这与我传递一个php页面有关，这个页面在传递时可能是空的...我如何捕获html中的html内容，以便pdf输出不是空白？

这是php页面：

<?php

function connect() {
  $dbh = mysql_connect ("localhost", "user", "password") or die ('I cannot connect to the database because: ' . mysql_error());
  mysql_select_db("PDS", $dbh); 
  return $dbh;
}

session_start();

if(isset($_SESSION['username'])){
  if(isset($_POST['entryId'])){
    //do something
    $dbh = connect();
    $ide = $_POST['entryId'];
    $usertab = $_POST['usertable'];
    $answertable = $usertab . "Answers";
    $entrytable = $usertab . "Entries";
    $query = mysql_query("SELECT e.date, q.questionNumber, q.question, q.sectionId, a.answer FROM $answertable a, Questions q, $entrytable e WHERE a.entryId = '$ide' AND a.questionId = q.questionId AND e.entryId = '$ide' ORDER BY q.questionNumber ASC;") or die("Error: " . mysql_error());

    if($query){
      //set variables

      $sectionOne = array();
      $sectionTwo = array();
      $sectionThree = array();
      $sectionFour = array();
      $sectionFive = array();
      while($row=mysql_fetch_assoc($query)){
    $date = $row['date'];
    $section = $row['sectionId'];
    switch($section){
    case '1':
      $sectionOne[] = $row;
      break;
    case '2':
      $sectionTwo[] = $row;
      break;
    case '3':
      $sectionThree[] = $row;
      break;
        case '4':
      $sectionFour[] = $row;
      break;
        case '5':
      $sectionFive[] = $row;
      break;
        default:    
      break;      
    }
      }
    }else{
      //error - sql failed
    }
  }

?>
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
   <head>
   <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
   <script src = "jQuery.js"></script>
   <script>
   $(document).ready(function(){
       $("#export").click(function(e){
       //post to html2pdfconverter.php
       $("#link").val("Testers/viewentryreport.php");
       $("#nm").val("Entry Report.pdf");
       $("form#sendanswers").submit();
       }); 
   });
  </script>
  <title>Personal Diary System - Entry Report - <?php echo($date); ?></title>
  </head>
  <body>
  <h1>Entry Report - <?php echo($date); ?></h1>    
  <div id = "buttons">
  <form id = "sendanswers" name = "sendanswers" action="Testers/html2pdfconverter.php" method="post">
  <input type = "hidden" name = "link" id = "link" value = "">
  <input type = "hidden" name = "nm" id = "nm" value = "">
  <input type = "button" name = "export" id = "export" value = "Export As PDF"/>
  </form>                        
  </div>                         
  <h3>Biological Information</h3>
  <?php
      $i = 0;                         
      foreach($sectionOne as &$value){
    if($i == 1 || $i == 3){
      $image = "assets/urine".$i.".png";
      echo("<br/>");
      echo($value['question']." <br/> "."<img src = \"$image\"/>");
      echo("<br/>");
    }else{
      echo($value['question'].' : '.$value['answer']);
    }
    echo("<br/>");
    $i++;
      }
  ?>
  <h3>Fatigue and Recovery</h3>
  <?php
      foreach($sectionTwo as &$value){
    echo($value['question'].' : '.$value['answer']);
    echo("<br/>");
      }
  ?>
  <h3>Illness and Injury</h3>
  <?php
      foreach($sectionThree as &$value){
    echo($value['question'].' : '.$value['answer']);
    echo("<br/>");
      }
  ?>
  <h3>Training Sessions</h3>
  <?php
      foreach($sectionFour as &$value){
    echo($value['question'].' : '.$value['answer']);
    echo("<br/>");
      }
  ?>
  <h3>General Feedback</h3>
  <?php 
     if(count($sectionFive)>0){
      foreach($sectionFive as &$value){
    echo($value['question'].' : '.$value['answer']);    
      }
     }else{
       $sectionFive = "User didn't leave any feedback";
       echo("User didn't leave any feedback");
     }
     echo("<br/>");
  ?>
  </body>
</html>
<?php
}
?>

和html2pdfconverter.php

<?php
require('html2fpdf.php');

if(isset($_POST['link'])){
  $url = $_POST['link'];
  $nm = $_POST['nm'];
  convert($url, $nm);
}

function convert($link, $name){
  $pdf=new HTML2FPDF();
  $pdf->AddPage();
  $fp = fopen($link,"r");
  $strContent = fread($fp, filesize($link));
  fclose($fp);
  $pdf->WriteHTML($strContent);
  $pdf->Output($name);
  echo ("PDF file generated successfully!");
}
?>

编辑@TIMFERRIS

我根据@TimeFerris的答案改变了我的转换函数：

function convert($link, $name){

  $pdf=new HTML2FPDF();
  $pdf->AddPage();
  $content = file_get_contents( $link ); //shorter than what you did
  ob_start();
  echo $content;
  $pdf->WriteHTML( ob_get_contents() );
  ob_end_clean();
  $pdf->Output($name);
  echo ("PDF file generated successfully!");
}

PDF文件已创建但仍为空白

Answer 1

我最近使用TCPDF完成了此操作。 TCPDF是FPDF的进一步开发版本。

有关转换为PDF的示例，请参阅this link。另外，here您可以找到更多示例。例61也可以派上用场。

TCPDF使用的示例代码：

$html = '<h1>HTML Example</h1>
<div style="text-align:center">IMAGES<br />
<img src="../images/logo_example.png" alt="test alt attribute" width="100" height="100" border="0" /><img src="../images/tiger.ai" alt="test alt attribute" width="100" height="100" border="0" /><img src="../images/logo_example.jpg" alt="test alt attribute" width="100" height="100" border="0" />
</div>';

// output the HTML content
$pdf->writeHTML($html, true, false, true, false, '');

Answer 2

您可以做的一件事是运行PHP文件，但使用输出缓冲来捕获PHP脚本正在写出的内容。然后，将这些内容保存到.html文件并将该文件传递给转换器。

Answer 3

您提供的php文件必须在有效的html代码之前运行解析器。

$content = file_get_contents( $filename ); //shorter than what you did
ob_start();
echo $content;
$pdf->WriteHTML( ob_get_contents() );
ob_end_clean();

将PHP文件中的HTML转换为PDF文件

3 个答案: