mirror of
https://github.com/janunger/rheinwerk-video-training.git
synced 2024-11-25 08:33:41 +01:00
273 lines
11 KiB
HTML
273 lines
11 KiB
HTML
|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
||
|
|
<html>
|
||
|
|
<head>
|
||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
|
||
|
|
<title>FAQ</title>
|
||
|
|
<link type="text/css" rel="stylesheet" href="fpdf.css">
|
||
|
|
<style type="text/css">
|
||
|
|
ul {list-style-type:none; margin:0; padding:0}
|
||
|
|
ul#answers li {margin-top:1.8em}
|
||
|
|
.question {font-weight:bold; color:#900000}
|
||
|
|
</style>
|
||
|
|
</head>
|
||
|
|
<body>
|
||
|
|
<h1>FAQ</h1>
|
||
|
|
<ul>
|
||
|
|
<li><b>1.</b> <a href='#q1'>What's exactly the license of FPDF? Are there any usage restrictions?</a></li>
|
||
|
|
<li><b>2.</b> <a href='#q2'>I get the following error when I try to generate a PDF: Some data has already been output, can't send PDF file</a></li>
|
||
|
|
<li><b>3.</b> <a href='#q3'>Accented letters are replaced with some strange characters like é.</a></li>
|
||
|
|
<li><b>4.</b> <a href='#q4'>I try to display the Euro symbol but it doesn't work.</a></li>
|
||
|
|
<li><b>5.</b> <a href='#q5'>I try to display a variable in the Header method but nothing prints.</a></li>
|
||
|
|
<li><b>6.</b> <a href='#q6'>I have defined the Header and Footer methods in my PDF class but nothing shows.</a></li>
|
||
|
|
<li><b>7.</b> <a href='#q7'>I can't make line breaks work. I put \n in the string printed by MultiCell but it doesn't work.</a></li>
|
||
|
|
<li><b>8.</b> <a href='#q8'>I use jQuery to generate the PDF but it doesn't show.</a></li>
|
||
|
|
<li><b>9.</b> <a href='#q9'>I draw a frame with very precise dimensions, but when printed I notice some differences.</a></li>
|
||
|
|
<li><b>10.</b> <a href='#q10'>I'd like to use the whole surface of the page, but when printed I always have some margins. How can I get rid of them?</a></li>
|
||
|
|
<li><b>11.</b> <a href='#q11'>How can I put a background in my PDF?</a></li>
|
||
|
|
<li><b>12.</b> <a href='#q12'>How can I set a specific header or footer on the first page?</a></li>
|
||
|
|
<li><b>13.</b> <a href='#q13'>I'd like to use extensions provided by different scripts. How can I combine them?</a></li>
|
||
|
|
<li><b>14.</b> <a href='#q14'>How can I open the PDF in a new tab?</a></li>
|
||
|
|
<li><b>15.</b> <a href='#q15'>How can I send the PDF by email?</a></li>
|
||
|
|
<li><b>16.</b> <a href='#q16'>What's the limit of the file sizes I can generate with FPDF?</a></li>
|
||
|
|
<li><b>17.</b> <a href='#q17'>Can I modify a PDF with FPDF?</a></li>
|
||
|
|
<li><b>18.</b> <a href='#q18'>I'd like to make a search engine in PHP and index PDF files. Can I do it with FPDF?</a></li>
|
||
|
|
<li><b>19.</b> <a href='#q19'>Can I convert an HTML page to PDF with FPDF?</a></li>
|
||
|
|
<li><b>20.</b> <a href='#q20'>Can I concatenate PDF files with FPDF?</a></li>
|
||
|
|
</ul>
|
||
|
|
|
||
|
|
<ul id='answers'>
|
||
|
|
<li id='q1'>
|
||
|
|
<p><b>1.</b> <span class='question'>What's exactly the license of FPDF? Are there any usage restrictions?</span></p>
|
||
|
|
FPDF is released under a permissive license: there is no usage restriction. You may embed it
|
||
|
|
freely in your application (commercial or not), with or without modifications.
|
||
|
|
</li>
|
||
|
|
|
||
|
|
<li id='q2'>
|
||
|
|
<p><b>2.</b> <span class='question'>I get the following error when I try to generate a PDF: Some data has already been output, can't send PDF file</span></p>
|
||
|
|
You must send nothing to the browser except the PDF itself: no HTML, no space, no carriage return. A common
|
||
|
|
case is having extra blank at the end of an included script file.<br>
|
||
|
|
If you can't figure out where the problem comes from, this other message appearing just before can help you:<br>
|
||
|
|
<br>
|
||
|
|
<b>Warning:</b> Cannot modify header information - headers already sent by (output started at script.php:X)<br>
|
||
|
|
<br>
|
||
|
|
It means that script.php outputs something at line X. Go to this line and fix it.
|
||
|
|
In case the message doesn't show, first check that you didn't disable warnings, then add this at the very
|
||
|
|
beginning of your script:
|
||
|
|
<div class="doc-source">
|
||
|
|
<pre><code>ob_end_clean();</code></pre>
|
||
|
|
</div>
|
||
|
|
If you still don't see it, disable zlib.output_compression in your php.ini and it should appear.
|
||
|
|
</li>
|
||
|
|
|
||
|
|
<li id='q3'>
|
||
|
|
<p><b>3.</b> <span class='question'>Accented letters are replaced with some strange characters like é.</span></p>
|
||
|
|
Don't use UTF-8 with the standard fonts; they expect text encoded in ISO-8859-1 or windows-1252.
|
||
|
|
You can use utf8_decode() to perform a conversion to ISO-8859-1:
|
||
|
|
<div class="doc-source">
|
||
|
|
<pre><code>$str = utf8_decode($str);</code></pre>
|
||
|
|
</div>
|
||
|
|
But some characters such as Euro won't be translated correctly. If the iconv extension is available, the
|
||
|
|
right way to do it is the following:
|
||
|
|
<div class="doc-source">
|
||
|
|
<pre><code>$str = iconv('UTF-8', 'windows-1252', $str);</code></pre>
|
||
|
|
</div>
|
||
|
|
In case you need characters outside windows-1252, take a look at tutorial #7 or
|
||
|
|
<a href="http://www.fpdf.org/?go=script&id=92" target="_blank">tFPDF</a>.
|
||
|
|
</li>
|
||
|
|
|
||
|
|
<li id='q4'>
|
||
|
|
<p><b>4.</b> <span class='question'>I try to display the Euro symbol but it doesn't work.</span></p>
|
||
|
|
The standard fonts have the Euro character at position 128. You can define a constant like this
|
||
|
|
for convenience:
|
||
|
|
<div class="doc-source">
|
||
|
|
<pre><code>define('EURO', chr(128));</code></pre>
|
||
|
|
</div>
|
||
|
|
</li>
|
||
|
|
|
||
|
|
<li id='q5'>
|
||
|
|
<p><b>5.</b> <span class='question'>I try to display a variable in the Header method but nothing prints.</span></p>
|
||
|
|
You have to use the <code>global</code> keyword to access global variables, for example:
|
||
|
|
<div class="doc-source">
|
||
|
|
<pre><code>function Header()
|
||
|
|
{
|
||
|
|
global $title;
|
||
|
|
|
||
|
|
$this->SetFont('Arial', 'B', 15);
|
||
|
|
$this->Cell(0, 10, $title, 1, 1, 'C');
|
||
|
|
}
|
||
|
|
|
||
|
|
$title = 'My title';</code></pre>
|
||
|
|
</div>
|
||
|
|
Alternatively, you can use an object property:
|
||
|
|
<div class="doc-source">
|
||
|
|
<pre><code>function Header()
|
||
|
|
{
|
||
|
|
$this->SetFont('Arial', 'B', 15);
|
||
|
|
$this->Cell(0, 10, $this->title, 1, 1, 'C');
|
||
|
|
}
|
||
|
|
|
||
|
|
$pdf->title = 'My title';</code></pre>
|
||
|
|
</div>
|
||
|
|
</li>
|
||
|
|
|
||
|
|
<li id='q6'>
|
||
|
|
<p><b>6.</b> <span class='question'>I have defined the Header and Footer methods in my PDF class but nothing shows.</span></p>
|
||
|
|
You have to create an object from the PDF class, not FPDF:
|
||
|
|
<div class="doc-source">
|
||
|
|
<pre><code>$pdf = new PDF();</code></pre>
|
||
|
|
</div>
|
||
|
|
</li>
|
||
|
|
|
||
|
|
<li id='q7'>
|
||
|
|
<p><b>7.</b> <span class='question'>I can't make line breaks work. I put \n in the string printed by MultiCell but it doesn't work.</span></p>
|
||
|
|
You have to enclose your string with double quotes, not single ones.
|
||
|
|
</li>
|
||
|
|
|
||
|
|
<li id='q8'>
|
||
|
|
<p><b>8.</b> <span class='question'>I use jQuery to generate the PDF but it doesn't show.</span></p>
|
||
|
|
Don't use an AJAX request to retrieve the PDF.
|
||
|
|
</li>
|
||
|
|
|
||
|
|
<li id='q9'>
|
||
|
|
<p><b>9.</b> <span class='question'>I draw a frame with very precise dimensions, but when printed I notice some differences.</span></p>
|
||
|
|
To respect dimensions, select "None" for the Page Scaling setting instead of "Shrink to Printable Area" in the print dialog box.
|
||
|
|
</li>
|
||
|
|
|
||
|
|
<li id='q10'>
|
||
|
|
<p><b>10.</b> <span class='question'>I'd like to use the whole surface of the page, but when printed I always have some margins. How can I get rid of them?</span></p>
|
||
|
|
Printers have physical margins (different depending on the models); it is therefore impossible to remove
|
||
|
|
them and print on the whole surface of the paper.
|
||
|
|
</li>
|
||
|
|
|
||
|
|
<li id='q11'>
|
||
|
|
<p><b>11.</b> <span class='question'>How can I put a background in my PDF?</span></p>
|
||
|
|
For a picture, call Image() in the Header() method, before any other output. To set a background color, use Rect().
|
||
|
|
</li>
|
||
|
|
|
||
|
|
<li id='q12'>
|
||
|
|
<p><b>12.</b> <span class='question'>How can I set a specific header or footer on the first page?</span></p>
|
||
|
|
Just test the page number:
|
||
|
|
<div class="doc-source">
|
||
|
|
<pre><code>function Header()
|
||
|
|
{
|
||
|
|
if($this->PageNo()==1)
|
||
|
|
{
|
||
|
|
//First page
|
||
|
|
...
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
//Other pages
|
||
|
|
...
|
||
|
|
}
|
||
|
|
}</code></pre>
|
||
|
|
</div>
|
||
|
|
</li>
|
||
|
|
|
||
|
|
<li id='q13'>
|
||
|
|
<p><b>13.</b> <span class='question'>I'd like to use extensions provided by different scripts. How can I combine them?</span></p>
|
||
|
|
Use an inheritance chain. If you have two classes, say A in a.php:
|
||
|
|
<div class="doc-source">
|
||
|
|
<pre><code>require('fpdf.php');
|
||
|
|
|
||
|
|
class A extends FPDF
|
||
|
|
{
|
||
|
|
...
|
||
|
|
}</code></pre>
|
||
|
|
</div>
|
||
|
|
and B in b.php:
|
||
|
|
<div class="doc-source">
|
||
|
|
<pre><code>require('fpdf.php');
|
||
|
|
|
||
|
|
class B extends FPDF
|
||
|
|
{
|
||
|
|
...
|
||
|
|
}</code></pre>
|
||
|
|
</div>
|
||
|
|
then make B extend A:
|
||
|
|
<div class="doc-source">
|
||
|
|
<pre><code>require('a.php');
|
||
|
|
|
||
|
|
class B extends A
|
||
|
|
{
|
||
|
|
...
|
||
|
|
}</code></pre>
|
||
|
|
</div>
|
||
|
|
and make your own class extend B:
|
||
|
|
<div class="doc-source">
|
||
|
|
<pre><code>require('b.php');
|
||
|
|
|
||
|
|
class PDF extends B
|
||
|
|
{
|
||
|
|
...
|
||
|
|
}
|
||
|
|
|
||
|
|
$pdf = new PDF();</code></pre>
|
||
|
|
</div>
|
||
|
|
</li>
|
||
|
|
|
||
|
|
<li id='q14'>
|
||
|
|
<p><b>14.</b> <span class='question'>How can I open the PDF in a new tab?</span></p>
|
||
|
|
Just do the same as you would for an HTML page or anything else: add a target="_blank" to your link or form.
|
||
|
|
</li>
|
||
|
|
|
||
|
|
<li id='q15'>
|
||
|
|
<p><b>15.</b> <span class='question'>How can I send the PDF by email?</span></p>
|
||
|
|
As for any other file, but an easy way is to use <a href="http://phpmailer.codeworxtech.com" target="_blank">PHPMailer</a> and
|
||
|
|
its in-memory attachment:
|
||
|
|
<div class="doc-source">
|
||
|
|
<pre><code>$mail = new PHPMailer();
|
||
|
|
...
|
||
|
|
$doc = $pdf->Output('S');
|
||
|
|
$mail->AddStringAttachment($doc, 'doc.pdf', 'base64', 'application/pdf');
|
||
|
|
$mail->Send();</code></pre>
|
||
|
|
</div>
|
||
|
|
</li>
|
||
|
|
|
||
|
|
<li id='q16'>
|
||
|
|
<p><b>16.</b> <span class='question'>What's the limit of the file sizes I can generate with FPDF?</span></p>
|
||
|
|
There is no particular limit. There are some constraints, however:
|
||
|
|
<br>
|
||
|
|
<br>
|
||
|
|
- There is usually a maximum memory size allocated to PHP scripts. For very big documents,
|
||
|
|
especially with images, the limit may be reached (the file being built in memory). The
|
||
|
|
parameter is configured in the php.ini file.
|
||
|
|
<br>
|
||
|
|
<br>
|
||
|
|
- The maximum execution time allocated to scripts defaults to 30 seconds. This limit can of course
|
||
|
|
be easily reached. It is configured in php.ini and may be altered dynamically with set_time_limit().
|
||
|
|
<br>
|
||
|
|
<br>
|
||
|
|
You can work around the memory limit with <a href="http://www.fpdf.org/?go=script&id=76" target="_blank">this script</a>.
|
||
|
|
</li>
|
||
|
|
|
||
|
|
<li id='q17'>
|
||
|
|
<p><b>17.</b> <span class='question'>Can I modify a PDF with FPDF?</span></p>
|
||
|
|
It's possible to import pages from an existing PDF document thanks to the
|
||
|
|
<a href="https://www.setasign.com/products/fpdi/about/" target="_blank">FPDI</a> extension.
|
||
|
|
Then you can add some content to them.
|
||
|
|
</li>
|
||
|
|
|
||
|
|
<li id='q18'>
|
||
|
|
<p><b>18.</b> <span class='question'>I'd like to make a search engine in PHP and index PDF files. Can I do it with FPDF?</span></p>
|
||
|
|
No. But a GPL C utility does exist, pdftotext, which is able to extract the textual content from a PDF.
|
||
|
|
It's provided with the <a href="http://www.foolabs.com/xpdf/" target="_blank">Xpdf</a> package.
|
||
|
|
</li>
|
||
|
|
|
||
|
|
<li id='q19'>
|
||
|
|
<p><b>19.</b> <span class='question'>Can I convert an HTML page to PDF with FPDF?</span></p>
|
||
|
|
Not real-world pages. But a GPL C utility does exist, <a href="https://www.msweet.org/projects.php?Z1" target="_blank">HTMLDOC</a>,
|
||
|
|
which allows to do it and gives good results.
|
||
|
|
</li>
|
||
|
|
|
||
|
|
<li id='q20'>
|
||
|
|
<p><b>20.</b> <span class='question'>Can I concatenate PDF files with FPDF?</span></p>
|
||
|
|
Not directly, but it's possible to use <a href="https://www.setasign.com/products/fpdi/demos/concatenate-fake/" target="_blank">FPDI</a>
|
||
|
|
to perform that task. Some free command-line tools also exist:
|
||
|
|
<a href="https://www.pdflabs.com/tools/pdftk-the-pdf-toolkit/" target="_blank">pdftk</a> and
|
||
|
|
<a href="http://thierry.schmit.free.fr/spip/spip.php?article15" target="_blank">mbtPdfAsm</a>.
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
</body>
|
||
|
|
</html>
|