php FPDF错误：部分数据已经输出，无法发送PDF
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FPDF error: Some data has already been output, can't send PDF
提问by Wondering Coder
I am using the fpdflibrary for my project, and I'm using this to extend one of the drupal module. These lines
我正在为我的项目使用fpdf库，并且我正在使用它来扩展 drupal 模块之一。这些线路
$pdf = new FPDF();
$pdf->AddPage();
$pdf->SetFont('Arial','B',16);
$pdf->Cell(40,10,'Hello World!');
$pdf->Output();
give me an error: FPDF error: Some data has already been output, can't send PDF
给我一个错误：FPDF错误：一些数据已经输出，无法发送PDF
I tried creating this in a separate file outside the drupal area name test.php and when viewed it worked. Anyone here know why this don't work? Or anyone here can point me a right pdf library which I can use in drupal to view HTML to PDF format.
我尝试在 drupal 区域名称 test.php 之外的单独文件中创建它，并且在查看时它起作用了。这里有人知道为什么这不起作用吗？或者这里的任何人都可以向我指出一个正确的 pdf 库，我可以在 drupal 中使用它来查看 HTML 到 PDF 格式。
回答by Gordon Bailey
For fpdf to work properly, there cannot be anyoutput at all beside what fpdf generates. For example, this will work:
为了让 fpdf 正常工作，除了 fpdf 生成的内容之外，根本没有任何输出。例如，这将起作用：
<?php
$pdf = new FPDF();
$pdf->AddPage();
$pdf->SetFont('Arial','B',16);
$pdf->Cell(40,10,'Hello World!');
$pdf->Output();
?>
While this will not (note the leading space before the opening <?tag)
虽然这不会（注意开始<?标签前的前导空格）
<?php
$pdf = new FPDF();
$pdf->AddPage();
$pdf->SetFont('Arial','B',16);
$pdf->Cell(40,10,'Hello World!');
$pdf->Output();
?>
Also, this will not work either (the echowill break it):
此外，这也不起作用（echo会破坏它）：
<?php
echo "About to create pdf";
$pdf = new FPDF();
$pdf->AddPage();
$pdf->SetFont('Arial','B',16);
$pdf->Cell(40,10,'Hello World!');
$pdf->Output();
?>
I'm not sure about the drupal side of things, but I know that absolutely zero non-fpdf output is a requirement for fpdf to work.
我不确定事物的 drupal 方面，但我知道绝对零非 fpdf 输出是 fpdf 工作的要求。
回答by Behlum Noman
add ob_start ();at the top and at the end add ob_end_flush();
添加ob_start ();在顶部和最后添加ob_end_flush();
<?php
ob_start();
require('fpdf.php');
$pdf = new FPDF();
$pdf->AddPage();
$pdf->SetFont('Arial','B',16);
$pdf->Cell(40,10,'Hello World!');
$pdf->Output();
ob_end_flush();
?>
回答by raghavendra
give me an error as below:FPDF error: Some data has already been output, can't send PDF
给我一个错误如下：FPDF error: Some data has already been output, can't send PDF
to over come this error:
go to fpdf.phpin that,goto line number 996
克服这个错误：转到fpdf.php那个，转到第 996 行
function Output($name='', $dest='')
after that make changes like this:
之后进行如下更改：
function Output($name='', $dest='') {
ob_clean(); //Output PDF to so
回答by Andrey Aires
Try to save the file without the option: "BOM comment", i.e. in Adobe Dreamweaver, you Save File As..., uncheckthe box below the filename that says, "Include Unicode signature(BOM)".
尝试在没有选项的情况下保存文件：“BOM 注释”，即在 Adobe Dreamweaver 中，您将文件另存为...，取消选中文件名下方的“包含 Unicode 签名（BOM）”框。
On Notepad++ you should select the menu: Encoding, "Encode in UTF-8 without BOM".
在 Notepad++ 上，您应该选择菜单：Encoding，“ Encode in UTF-8 without BOM”。
And make it default for other files you create, it will spare you a lot of headaches in future.
并将其设置为您创建的其他文件的默认值，它会在将来为您省去很多麻烦。
回答by Cino Jose
Hi do you have a session header on the top of your page. or any includes If you have then try to add this codes on top pf your page it should works fine.
您好，您的页面顶部是否有会话标题。或任何包含如果您尝试在页面顶部添加此代码，它应该可以正常工作。
<?
while (ob_get_level())
ob_end_clean();
header("Content-Encoding: None", true);
?>
cheers :-)
欢呼:-)
回答by HansWurst
The FPDF Error Message will point you to the PHP Line that is sending some content.
FPDF 错误消息会将您指向发送某些内容的 PHP 行。
If you get no hint what File & Line send some content you probably have an encoding mismatch in your include / require Files.
如果您没有得到任何提示，文件和行发送了一些内容，则您的包含/要求文件中可能存在编码不匹配。
For me
为了我
fpdf.phpwas ANSI-encoded,- my
pdf-generator.phpwas UTF-8-encoded and - my database-connect-inlude was UTF-8-encoded (this UTF-8-encoding did raise the FPDF error. I had to switch it back to ANSI)
fpdf.php是ANSI编码的，- my
pdf-generator.php是 UTF-8 编码的，并且 - 我的数据库连接插入是 UTF-8 编码的（这种 UTF-8 编码确实引发了 FPDF 错误。我不得不将其切换回 ANSI）
回答by Santos L. Victor
First step check the permissions on the folders second step put this
第一步检查文件夹的权限第二步把这个
ob_start();
before the line
行前
$pdf->Output();
回答by Cliff Ombachi
if you're code outputs notices/warnings before the PDF generation, try turning them off. error_reporting(0). Then work on the warnings there-after
如果您在生成 PDF 之前代码输出通知/警告，请尝试将它们关闭。error_reporting(0). 然后在之后处理警告
回答by Victor
In my case i had set:
就我而言，我设置了：
ini_set('display_errors', 'on');
error_reporting(E_ALL | E_STRICT);
When i made the request to generate the report, some warnings were displayed in the browser (like the usage of deprecated functions).
Turning offthe display_errorsoption, the report was generated successfully.
当我提出生成报告的请求时，浏览器中显示了一些警告（如使用已弃用的功能）。
谈到off该display_errors选项后，已成功生成报告。
回答by Wasim Khan
I used the following and it worked for me
我使用了以下内容，它对我有用
require_once ('pdf/fpdf.php');
$pdf = new FPDF();
$pdf->AddPage();
$pdf->SetFont('Arial','B',16);
$pdf->Cell(40,10,'Hello World!');
$pdf->Output(F,'/var/www/html/PATH/filename.pdf');
ob_end_flush();
