blocks|key|3116875|text|要让fpdf正常工作，除了fpdf生成的内容之外，根本不能有任何输出。例如，这将会起作用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3116876|<?php
$pdf+=+new+FPDF();
$pdf->AddPage();
$pdf->SetFont('Arial','B',16);
$pdf->Cell(40,10,'Hello+World!');
$pdf->Output();
?>|code-block|syntax|javascript|3116877|而这不会(注意开始<?标记之前的前导空格)|offset|length|style|CODE|3116878|+<?php
$pdf+=+new+FPDF();
$pdf->AddPage();
$pdf->SetFont('Arial','B',16);
$pdf->Cell(40,10,'Hello+World!');
$pdf->Output();
?>|3116879|此外，这也不会起作用(+echo会破坏它)：|3116880|<?php
echo+"About+to+create+pdf";
$pdf+=+new+FPDF();
$pdf->AddPage();
$pdf->SetFont('Arial','B',16);
$pdf->Cell(40,10,'Hello+World!');
$pdf->Output();
?>|3116881|我不确定drupal方面的事情，但我知道绝对零的非fpdf输出是fpdf工作的必要条件。|3116882|entityMap^0|0|0|9|2|0|0|C|4|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@$I|Z|J|10|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|12|8|@$I|13|J|14|K|L]]|9|@]|A|$]]|$1|Q|3|R|5|D|7|15|8|@]|9|@]|A|$E|F]]|$1|S|3|T|5|6|7|16|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|V|$]]

For fpdf to work properly, there cannot be any output at all beside what fpdf generates. For example, this will work:

<pre><code>&lt;?php
$pdf = new FPDF();
$pdf-&gt;AddPage();
$pdf-&gt;SetFont('Arial','B',16);
$pdf-&gt;Cell(40,10,'Hello World!');
$pdf-&gt;Output();
?&gt;
</code></pre>

While this will not (note the leading space before the opening <code>&lt;?</code> tag)

<pre><code> &lt;?php
$pdf = new FPDF();
$pdf-&gt;AddPage();
$pdf-&gt;SetFont('Arial','B',16);
$pdf-&gt;Cell(40,10,'Hello World!');
$pdf-&gt;Output();
?&gt;
</code></pre>

Also, this will not work either (the <code>echo</code> will break it):

<pre><code>&lt;?php
echo "About to create pdf";
$pdf = new FPDF();
$pdf-&gt;AddPage();
$pdf-&gt;SetFont('Arial','B',16);
$pdf-&gt;Cell(40,10,'Hello World!');
$pdf-&gt;Output();
?&gt;
</code></pre>

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.

blocks|key|238021|text|您好，您的页面顶部有会话标题吗？或者任何包含，如果你已经尝试将这些代码添加到你的页面顶部，它应该工作得很好。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|238022|<?

while+(ob_get_level())
ob_end_clean();
header("Content-Encoding:+None",+true);

?>|code-block|syntax|javascript|238023|干杯:-)|238024|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

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. 

<pre><code>&lt;?

while (ob_get_level())
ob_end_clean();
header("Content-Encoding: None", true);

?&gt;
</code></pre>

cheers :-)

blocks|key|239883|text|FPDF错误消息会将您指向正在发送某些内容的PHP行。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|239884|如果您没有得到什么文件和行发送某些内容的提示，则可能是include+/+require文件中的编码不匹配。|239885|对我来说|239886|239887|fpdf.php是ANSI编码的，|unordered-list-item|offset|length|style|CODE|239888|my+pdf-generator.php是UTF-8编码的，|239889|我的数据库连接是UTF-8编码的(这种UTF-8编码确实引发了FPDF错误。我不得不把它换回美国国家标准协会)|239890|239891|entityMap^0|0|0|0|0|0|8|0|3|H|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|A|$]]|$1|G|3|H|5|I|7|Y|8|@$J|Z|K|10|L|M]]|9|@]|A|$]]|$1|N|3|O|5|I|7|11|8|@$J|12|K|13|L|M]]|9|@]|A|$]]|$1|P|3|Q|5|I|7|14|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|15|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|16|8|@]|9|@]|A|$]]]|T|$]]

The FPDF Error Message will point you to the PHP Line that is sending some content.

If you get no hint what File &amp; Line send some content you probably have an encoding mismatch in your include / require Files. 

For me 

<ul>
<li><code>fpdf.php</code> was ANSI-encoded, </li>
<li>my <code>pdf-generator.php</code> was UTF-8-encoded and </li>
<li>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)</li>
</ul>

blocks|key|2903066|text|尝试保存文件时不使用选项："BOM+comment"，即在Adobe+Dreamweaver中，您可以将文件另存为...，然后取消选中文件名下面的复选框"Include++Unicode+signature(BOM)“。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2903067|在Notepad%2B%2B上，你应该选择菜单:UTF，"Encode+in+UTF-8+without+BOM“。|2903068|并将其设置为您创建的其他文件的默认设置，这将使您在将来省去很多麻烦。|2903069|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

Try to save the file without the option: "BOM comment", i.e. in Adobe Dreamweaver, you Save File As..., uncheck the box below the filename that says, "Include Unicode signature(BOM)".

On Notepad++ you should select the menu: 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.

blocks|key|2903090|text|给我一个错误，如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2903091|FPDF+error:+Some+data+has+already+been+output,+can't+send+PDF|offset|length|style|CODE|2903092|要克服这个错误:转到其中的fpdf.php，转到996行|2903093|function+Output($name='',+$dest='')|code-block|syntax|javascript|2903094|在此之后，进行如下更改：|2903095|function+Output($name='',+$dest='')+{+++
++++ob_clean();+++++//Output+PDF+to+so|2903096|entityMap^0|0|0|1P|0|D|8|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@$D|W|E|X|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|Y|8|@$D|Z|E|10|F|G]]|9|@]|A|$]]|$1|J|3|K|5|L|7|11|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|12|8|@]|9|@]|A|$]]|$1|Q|3|R|5|L|7|13|8|@]|9|@]|A|$M|N]]|$1|S|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|T|$]]

give me an error as below: 
<code>FPDF error: Some data has already been output, can't send PDF</code> 

to over come this error:
go to <code>fpdf.php</code> in that,goto line number 996 

<pre><code>function Output($name='', $dest='')
</code></pre>

after that make changes like this: 

<pre><code>function Output($name='', $dest='') { 
 ob_clean(); //Output PDF to so
</code></pre>

blocks|key|239996|text|在我的例子中，我设置了：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|239997|ini_set('display_errors',+'on');
error_reporting(E_ALL+%7C+E_STRICT);|code-block|syntax|javascript|239998|当我发出生成报告的请求时，浏览器中显示了一些警告(如使用已弃用的函数)。|239999|打开off+display_errors选项，报告已成功生成。|offset|length|style|CODE|240000|entityMap^0|0|0|0|2|3|6|E|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|T|8|@$K|U|L|V|M|N]|$K|W|L|X|M|N]]|9|@]|A|$]]|$1|O|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|P|$]]

In my case i had set:

<pre><code>ini_set('display_errors', 'on');
error_reporting(E_ALL | E_STRICT);
</code></pre>

When i made the request to generate the report, some warnings were displayed in the browser (like the usage of deprecated functions). 
Turning <code>off</code> the <code>display_errors</code> option, the report was generated successfully.

blocks|key|3117252|text|你需要调用库|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3117253|3117254|请求('fpdf.php')；|blockquote|3117255|3117256|3117257|<?php
require('fpdf.php');

$pdf+=+new+FPDF();
$pdf->AddPage();
$pdf->SetFont('Arial','B',16);
$pdf->Cell(40,10,'¡Hola,+Mundo!');
$pdf->Output();
?>|code-block|syntax|javascript|3117258|http://www.fpdf.org/|offset|length|3117259|http://www.fpdf.org/es/tutorial/tuto1.htm|3117260|entityMap|0|LINK|mutability|MUTABLE|url|1^0|0|0|0|0|0|0|0|K|0|0|0|15|1|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|11|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|12|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|13|8|@]|9|@]|A|$]]|$1|G|3|-4|5|6|7|14|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|15|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|16|8|@]|9|@$O|17|P|18|1|19]]|A|$]]|$1|Q|3|R|5|6|7|1A|8|@]|9|@$O|1B|P|1C|1|1D]]|A|$]]|$1|S|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|N]]|Z|$5|V|W|X|A|$Y|R]]]]

You need to call the library

<blockquote>
 require ('fpdf.php');
</blockquote>

<pre><code>&lt;?php
require('fpdf.php');

$pdf = new FPDF();
$pdf-&gt;AddPage();
$pdf-&gt;SetFont('Arial','B',16);
$pdf-&gt;Cell(40,10,'¡Hola, Mundo!');
$pdf-&gt;Output();
?&gt;
</code></pre>

<a href="http://www.fpdf.org/" rel="nofollow">http://www.fpdf.org/</a>

<a href="http://www.fpdf.org/es/tutorial/tuto1.htm" rel="nofollow">http://www.fpdf.org/es/tutorial/tuto1.htm</a>

blocks|key|240019|text|在顶部添加ob_start+();，在末尾添加ob_end_flush();|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|240020|<?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();+
?>|code-block|syntax|javascript|240021|entityMap^0|5|C|N|F|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

add <code>ob_start ();</code> at the top and at the end add <code>ob_end_flush();</code>

<pre><code>&lt;?php
 ob_start();
 require('fpdf.php');
 $pdf = new FPDF();
 $pdf-&gt;AddPage();
 $pdf-&gt;SetFont('Arial','B',16);
 $pdf-&gt;Cell(40,10,'Hello World!');
 $pdf-&gt;Output();
 ob_end_flush(); 
?&gt;
</code></pre>

blocks|key|3117309|text|第一步检查文件夹的权限第二步将此|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3117310|ob_start();+|code-block|syntax|javascript|3117311|在行之前|3117312|$pdf->Output();|3117313|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

First step
check the permissions on the folders
second step
put this 

<pre><code>ob_start(); 
</code></pre>

before the line 

<pre><code>$pdf-&gt;Output();
</code></pre>

blocks|key|234574|text|如果您的代码在PDF生成之前输出通知/警告，请尝试将其关闭。error_reporting(0)。然后在那里处理警告-之后|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|234575|entityMap^0|U|I|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

if you're code outputs notices/warnings before the PDF generation, try turning them off. <code>error_reporting(0)</code>. Then work on the warnings there-after

blocks|key|238252|text|我使用了下面的方法，它对我很有效|type|unstyled|depth|inlineStyleRanges|entityRanges|data|238253|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();|code-block|syntax|javascript|238254|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I used the following and it worked for me 

<pre><code>require_once ('pdf/fpdf.php');

$pdf = new FPDF();
$pdf-&gt;AddPage();
$pdf-&gt;SetFont('Arial','B',16);
$pdf-&gt;Cell(40,10,'Hello World!');
$pdf-&gt;Output(F,'/var/www/html/PATH/filename.pdf');
ob_end_flush();
</code></pre>

blocks|key|3117405|text|添加到脚本的开头|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3117406|ob_start();
require+('fpdf.php');|code-block|syntax|javascript|3117407|最后，在output()之后|offset|length|style|CODE|3117408|ob_end_flush();|3117409|这对我很有效！=)|3117410|entityMap^0|0|0|4|8|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@$I|V|J|W|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

Add to the beginning of the script

<pre><code>ob_start();
require ('fpdf.php');
</code></pre>

and at the end, after <code>output()</code>

<pre><code>ob_end_flush();
</code></pre>

It worked for me! =)

blocks|key|2903360|text|致命错误:未捕获异常'+exception‘，消息为'FPDF错误:已输出某些数据，无法发送PDF文件(输出开始于/home/asri123/public_html/bill/invoice/fpdf.php:271堆栈跟踪中的/home/asri123/public_html/bill/invoice/invoice.php:743)‘：#0+/home/asri123/public_html/bill/invoice/fpdf.php(1052)：FPDF>错误(’某些数据具有...‘)+#1+/home/asri123/public_html/bill/invoice/fpdf.php(1012)：FPDF>_checkoutput()#2MSFS+FPDF->输出(‘/home/asri123/public_html/bill/invoice/mirasbill.php(262)：/2018-19/76...’，D‘)+#3+{main}在第271行的/home/asri123/public_html/bill/invoice/fpdf.php中抛出|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2903361|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Fatal error: Uncaught exception 'Exception' with message 'FPDF error: Some data has already been output, can't send PDF file (output started at /home/asri123/public_html/bill/invoice/invoice.php:743)' in /home/asri123/public_html/bill/invoice/fpdf.php:271 Stack trace: #0 /home/asri123/public_html/bill/invoice/fpdf.php(1052): FPDF->Error('Some data has a...') #1 /home/asri123/public_html/bill/invoice/fpdf.php(1012): FPDF->_checkoutput() #2 /home/asri123/public_html/bill/invoice/mirasbill.php(262): FPDF->Output('MSFS/2018-19/76...', 'D') #3 {main} thrown in /home/asri123/public_html/bill/invoice/fpdf.php on line 271

blocks|key|240095|text|甚至在包含的php文件中只有一个空格就会导致该警告。任何方式都不应该有任何输出。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|240096|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Even a single space in the included php files causes that warning. There shouldn't be any output in any way.

blocks|key|2903425|text|另一个其他人没有在这里发布的答案...PHP仔细检查文件的编码，确保它不是UTF-8以外的编码。错误的代码编辑器(或FTP上载？)可以扰乱文件的编码，在这种情况下，本线程中提到的其他修复都不会有帮助。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2903426|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Another answer that nobody else has posted here... Double-check the encoding of your PHP file and make sure that it's not something other than UTF-8. The wrong code editor (or FTP upload?) can mess with the file's encoding in which case none of the other fixes mentioned in this thread will help.

I am using the <a href="http://www.fpdf.org/" rel="noreferrer">fpdf</a> library for my project, and I'm using this to extend one of the drupal module. These lines

<pre><code>$pdf = new FPDF();
$pdf-&gt;AddPage();
$pdf-&gt;SetFont('Arial','B',16);
$pdf-&gt;Cell(40,10,'Hello World!');
$pdf-&gt;Output();
</code></pre>

give me an error: FPDF error: Some data has already been output, can't send 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.

FPDF error: Some data has already been output, can't send PDF

数据库

我在我的项目中使用了库，并使用它来扩展其中一个drupal模块。这几行$pdf = new FPDF();$pdf->AddPage();$pdf->SetFont('Arial','B',16);$pdf->Cell(40,10,'Hello World!');$pdf->Output();给我一个错误:PDF错误:...

问FPDF错误:某些数据已输出，无法发送PDF
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