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Jefferson Gonçalves
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Snappy

#Snappy

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Snappy is a PHP library allowing thumbnail, snapshot or PDF generation from a url or a html page. It uses the excellent webkit-based wkhtmltopdf and wkhtmltoimage available on OSX, linux, windows.

You will have to download wkhtmltopdf 0.12.x in order to use Snappy.

Please, check FAQ before opening a new issue. Snappy is a tiny wrapper around wkhtmltox, so lots of issues are already answered, resolved or wkhtmltox ones.

Following integrations are available:

#Installation using Composer

composer require knplabs/knp-snappy

#Usage

⚠️ Security Warning

The --enable-local-file-access option in wkhtmltopdf can be risky if used with untrusted HTML or JavaScript. This may expose local files or lead to remote code execution.

To stay safe:

  • Avoid enabling --enable-local-file-access unless necessary.
  • Always sanitize user input before processing.
  • Run wkhtmltopdf in a sandbox like AppArmor or SELinux.
  • For untrusted content, consider alternatives like WeasyPrint, Prince, or Puppeteer.

This risk was responsibly reported by
Nikita Sveshnikov (Positive Technologies).

🔗 Official recommendations

#Initialization

<?php

require __DIR__ . '/vendor/autoload.php';

use Knp\Snappy\Pdf;

$snappy = new Pdf('/usr/local/bin/wkhtmltopdf');

// or you can do it in two steps
$snappy = new Pdf();
$snappy->setBinary('/usr/local/bin/wkhtmltopdf');

#Display the pdf in the browser

$snappy = new Pdf('/usr/local/bin/wkhtmltopdf');
header('Content-Type: application/pdf');
echo $snappy->getOutput('http://www.github.com');

#Download the pdf from the browser

$snappy = new Pdf('/usr/local/bin/wkhtmltopdf');
header('Content-Type: application/pdf');
header('Content-Disposition: attachment; filename="file.pdf"');
echo $snappy->getOutput('http://www.github.com');

#Merge multiple urls into one pdf

$snappy = new Pdf('/usr/local/bin/wkhtmltopdf');
header('Content-Type: application/pdf');
header('Content-Disposition: attachment; filename="file.pdf"');
echo $snappy->getOutput(array('http://www.github.com','http://www.knplabs.com','http://www.php.net'));

#Generate local pdf file

$snappy = new Pdf('/usr/local/bin/wkhtmltopdf');
$snappy->generateFromHtml('<h1>Bill</h1><p>You owe me money, dude.</p>', '/tmp/bill-123.pdf');

#Pass options to snappy

// Type wkhtmltopdf -H to see the list of options
$snappy = new Pdf('/usr/local/bin/wkhtmltopdf');
$snappy->setOption('disable-javascript', true);
$snappy->setOption('no-background', true);
$snappy->setOption('allow', array('/path1', '/path2'));
$snappy->setOption('cookie', array('key' => 'value', 'key2' => 'value2'));
$snappy->setOption('post', array('key' => 'value'));
$snappy->setOption('cover', 'pathToCover.html');
// .. or pass a cover as html
$snappy->setOption('cover', '<h1>Bill cover</h1>');
$snappy->setOption('toc', true);
$snappy->setOption('cache-dir', '/path/to/cache/dir');

#Reset options

Options can be reset to their initial values with resetOptions() method.

$snappy = new Pdf('/usr/local/bin/wkhtmltopdf');
// Set some options
$snappy->setOption('copies' => 4);
// ..
// Reset options
$snappy->resetOptions();

#wkhtmltopdf binary as composer dependencies

If you want to download wkhtmltopdf and wkhtmltoimage with composer you add to composer.json:

composer require h4cc/wkhtmltopdf-i386 0.12.x
composer require h4cc/wkhtmltoimage-i386 0.12.x

or this if you are in 64 bit based system:

composer require h4cc/wkhtmltopdf-amd64 0.12.x
composer require h4cc/wkhtmltoimage-amd64 0.12.x

And then you can use it

<?php

use Knp\Snappy\Pdf;

$myProjectDirectory = '/path/to/my/project';

$snappy = new Pdf($myProjectDirectory . '/vendor/h4cc/wkhtmltopdf-i386/bin/wkhtmltopdf-i386');

// or

$snappy = new Pdf($myProjectDirectory . '/vendor/h4cc/wkhtmltopdf-amd64/bin/wkhtmltopdf-amd64');

N.B. These static binaries are extracted from Debian7 packages, so it might not be compatible with non-debian based linux distros

#Some use cases

If you want to generate table of contents and you want to use custom XSL stylesheet, do the following:

<?php
$snappy = new Pdf('/path/to/binary');

$snappy->setOption('toc', true);
$snappy->setOption('xsl-style-sheet', 'http://path/to/stylesheet.xsl') //or local file;

$snappy->generateFromHtml('<p>Some content</p>', 'test.pdf');

#Bugs & Support

If you found a bug please fill a detailed issue with all the following points. If you need some help, please at least provide a complete reproducer so we could help you based on facts rather than assumptions.

  • OS and its version
  • Wkhtmltopdf, its version and how you installed it
  • A complete reproducer with relevant php and html/css/js code

If your reproducer is big, please try to shrink it. It will help everyone to narrow the bug.

#Maintainers

KNPLabs is looking for maintainers (see why).

If you are interested, feel free to open a PR to ask to be added as a maintainer.

We’ll be glad to hear from you :)

#Credits

Snappy has been originally developed by the KnpLabs team.

Neue Version verfügbar.